Small Gardens Research Articles

Creating an endless visual space: An Isovist analysis of a small traditional Chinese garden

Traditional Chinese private gardens, as a unique spatial typology, create a maze-like quality through the arrangement of sightlines and pathways, offering occupants a sense of perpetual circulation and boundless time. The rich experiential nature cultivated within these confined spaces, alongside the ecological worldview of “harmony between heaven and humanity,” holds significant relevance for urban landscape design and the sustainable development of urban environments. While there is ample research literature on various aspects of garden spaces, studies exploring how private gardens generate visually infinite and cyclic spatial experiences within limited areas often remain confined to intuitive analysis, lacking concrete and rational explanations. This study employs the method of Isovist Analysis to test the validity of the spatial consciousness of “Limitless vision, Endless recurrence” within the spatial layout and tour organization of traditional private gardens, using the analysis of Isovists at eight scenic spots within the Xiaocanglang Water Courtyard, as well as an examination of visual-spatial changes along both primary and secondary pathways in different tour directions. It is hoped that this research method will serve as a tool for urban designers and landscape architects to assess spatial-visual characteristics and experiences during the design phase.

Does every public open space (POS) contribute to sustainable city development? An assessment of inefficient POS in Beijing

Public open space (POS) plays a crucial role in influencing the urban environment, ecology, public health, and economic vitality. However, not every POS is being efficiently utilized, while the inefficient POSs occupy large areas and can negatively affect socio-economic development, thus posing a threat to sustainable city development. Existing studies evaluate POSs solely based on benefit outcomes, but ignore POS functional types and contextual environments. To address this issue, a categorized, integrated, and relative evaluation method, i.e., utilization efficiency (UE), is proposed to identify inefficient POSs, where essentially measures the ratio from benefit outcome to resource occupation of each POS. We firstly classify POSs into five types by considering their core functions, then measure their UEs to extract efficient and inefficient POS, and finally visualize key causes of different types of POS. Our results reveal 3,138 inefficient out of 10,943 POSs in Beijing, and show the inefficient POSs that are concentrated in the southern Beijing and northern regions between the 5th and 6th ring roads, mainly affected by local population density and environmental resource. Drawing on the features of inefficient POSs, it is suggested to increase small green spaces and sky gardens in the downtown areas, improve service facilities and basic tourism infrastructure in the suburbs. Accordingly, this study firstly incorporates POS functional types and resource occupation into the utilization efficiency evaluation, providing spatial optimization recommendations of POSs to facilitate sustainable city development.

Community Co-creation through knowledge (Co)Production: The engagement of universities in promoting rural revitalization in China

The global discourse on the role of universities in rural revitalization has gained significant attention. The proposition is to leverage university expertise and resources to support rural development, including knowledge (co)production, community co-creation, and volunteerism – a practice that essentially bridges local actors and their knowledge with external actors and their knowledge. As advocated by UN Habitat III, the collaboration between universities and rural communities is an initiative exemplified by China's “Jointly Create a Beautiful Environment and a Happy Life” to enhance the built environment. This study aims to comprehensively investigate the implementation and outcomes of the “Rural Four Small Gardens” projects, which serve as a vital community development initiative within the Hongtang Village in Fengqing County, Yunnan Province, China. The research discusses those processes, observing opportunities for knowledge (co)production across diverse stakeholders in line with neo-endogenous rural development thinking. By exploring the co-creation approach employed in these projects, we seek to unravel how academia and local communities collaborate to address multifaceted challenges in rural areas. We argue that: 1) The engagement of rural communities through collaborative planning workshops serves as the fundamental cornerstone for university paired-up assistance; 2) the co-creation model for improving rural settlement necessitates the collective efforts of multiple stakeholders; 3) university faculty and students play pivotal roles during the process of service learning, practice research, and knowledge (co)production with villagers; and 4) Knowledge (co)production entails a dynamic process of co-construction, co-governance, and resource sharing, exemplified by co-creation initiatives of home development, farmyard enhancement, and infrastructure projects. The research offers insights for global universities seeking to engage in similar paired-up assistance initiatives, underscores the significance of co-creation in rural development, and enlightens planning education in practice and service.

Vegetation density is the main driver of insect species richness and diversity in small private urban front gardens

Urbanisation changes natural ecosystems and vegetation to urban green spaces, and causes insect communities to experience novel challenges for survival. New evidence suggests that urban green spaces, no matter how small, can provide meaningful habitats for insects. Information on design and management of small gardens (<6m2) in dense urban areas is still scarce. In particular, it is hardly known which garden designs provide most benefits to insects. We surveyed 65 small urban façade gardens (μ=1.7m2) in Amsterdam and The Hague in The Netherlands and measured various garden attributes that are expected to be relevant for general, flower-visiting and herbivorous insect species richness and diversity. Plant coverage and richness were the strongest predictors of insect biodiversity and species richness. We found no support for associations with native plants or garden size. Synthesis and applicationsTo strengthen insect biodiversity in the urban environment, we recommend future design of urban green spaces to focus on maximising coverage and richness of vegetation. Although there are advantages to using native species, we acknowledge that garden owners often prefer exotic species. Some of these can also affect insect diversity and abundances positively.

Rare yet relevant: Trondheim Cooperative Housing Association

ABSTRACT The paper explores the history of the housing cooperative Trondhjems Kooperative Boligselskap (TKB) [The Trondheim Cooperative Housing Association] in relation to societal and political currents in contemporary Norway. The article also discusses how the neighbourhood and its architectural layout were adapted to changing uses over a 100-year period. Established in 1922, the TKB is the second-oldest housing cooperative in Norway. An important distinction from similar cooperatives was its construction process, where members of the construction workers’ union built their own homes and set up a production unit to continue developing new projects. Two related movements contributed to the TKBB’s foundation: Firstly, the work of the Norwegian Association of Housing Reforms, and the Own Homes movement, both inspired by the Ebenezer Howard Garden City concept. Secondly, the labour movement, which initiated the construction of the TKB. The main actor behind the housing association was the Norwegian architect and planner, Sverre Pedersen. Consisting of 86 units in 11 duplexes and 16 quadruplexes, the timber houses are organized with small gardens and within larger green communal spaces. The article elaborates on how elements from the TKB’s organizational and architectural principles are relevant to developing social housing in Norway today.

Long-term performance of wastewater gardens: follow-up on the status of the wastewater garden in Temacine – Algeria

ABSTRACT This work investigated the long-term performance of a small wastewater garden (WWG) system for treating municipal wastewater, which has been operating continuously since 2007. The studied system consisted of a horizontal subsurface flow (HFCW) and treated a flow rate of 15 m3/day. Results from 15 years of operation showed that the system has an average removal efficiency of 90.76, 85.12, 89.43, 66.87, 94.74, and 94.74% for total suspended solids (TSS), chemical oxygen demand (COD), biochemical oxygen demand (BOD5), nitrites (NO2–), nitrates (NO3–), and orthophosphates (PO43−), respectively. The high efficiency of the WWG plant was achieved during 2018–2022 compared to the two first years of operation (apart from the TSS). It was noted that the removal of BOD5, NO2–, NO3–, and PO43− has been improved in the last years of operation. The elimination COD remained relatively consistent between the initial and present period of operation. The finding confirms the high efficiency in the long-term operation of municipal wastewater treatment. Thus, it can serve as a suitable solution for small communities, especially in arid climate areas.

The Path of Rural Social Capital Improvement in China from the Perspective of Planners: A Case Study of Hongtang Village in Yunnan Province

China’s rural areas have long been backward in development, and many villages have completed poverty alleviation with the help of the government. Facing the requirements of sustainable development, it is necessary to change the development path, continuously increase social capital, and effectively connect with government investment resources. The existing research and practice mostly construct the strategy of social capital from the inside of the village, lacking interaction with the superior government. This paper argues for the method of planners’ intervention. The advantage is that it links the power of government and villagers, creates a perceptible, experiential, valuable material environment, and promotes collective action. Through this process, the knowledge interaction and social relations in the village can be improved. The purpose of this paper is to study how participatory planning affects the content and mechanism of this process mentioned above. Taking Hongtang village as a case study, we analyze the in-depth changes that participatory planning has brought to the rural space and social level. In the participatory planning practice of Hongtang village, college rural planners took a small vegetable garden as the breakthrough point to stimulate villagers’ participation. In the process of the upgrade, planners evolved the interaction between the village committee and villagers in the path of IMEE, which is “Intervene, Motivate, Enable, Empower”. Moreover, planners always maintained contact with the higher-level government. Through the upgrade of small vegetable gardens, the villagers’ initiative was brought into practice, the social capital was fully explored, and an effective link with the government’s resource allocation was realized.

Weed Flora of Small Tea Gardens of North Lakhimpur District, Assam and its Traditional Medicinal Demands

Weed Flora of Small Tea Gardens of North Lakhimpur District, Assam and its Traditional Medicinal Demands

Study on droplet deposition characteristics and application of small and medium crown garden plants sprayed by UAV sprayer.

The Unmanned Aerial Vehicle (UAV) sprayer has the advantages of high work efficiency, simple operation, and high safety factor, and has broad application prospects UAV sprayer are widely used in the agricultural field, and the application of UAV sprayer spraying technology in agriculture has provided convenience and increased profits for farmers, and has also become a research hotspot in the field of agriculture. In recent years, although research has been conducted on the feasibility and application effects of UAV sprayer spraying crown shaped plants, there have been no experiments or studies in the field of garden plants. This experiment conducted a droplet deposition experiment of UAV sprayer spraying garden plants, exploring the droplet deposition effect of UAV sprayer in the field of garden plants, and conducting experiments on the influence of spray volume and nozzle type on droplet deposition. The experimental results showed that the canopy performance of small and medium-sized garden plants was better at a flight altitude of 1.5m, a spray volume of 180L/hm2, and a flight speed of 2m/s. Reducing flight altitude, increasing spray volume, and reducing flight speed can improve the distribution of droplets in the canopy. This experiment lays the foundation for the application of UAV sprayer for the prevention and control of pests and diseases in garden plants, as well as for the application of growth regulators, and provides a basis for further innovative research in the field of garden plant application technology.

Comparative analysis of biochar production methods and their impacts on biochar physico-chemical properties and adsorption of heavy metals

Rapid industrialization, urbanization, and population growth result in vast amounts of organic waste being produced, including agricultural waste, animal waste, industrial waste, sewage sludge, and municipal solid waste. Biochar production from solid waste has become a popular waste management method. However, in rural areas of developing nations, biomass is typically used for cooking without being charred. Urban biowaste-derived biochar may enhance soil fertility and overall soil health. However, large-scale biochar production from an electronic muffle furnace could be very expensive, and there is little information on the conversion of biowastes to biochar using traditional kilns or its effects on biochar characteristics, and farmers' biochar production methods are yet underdeveloped. Hence, this study provides biochar production from biowastes using two production methods: 1) a traditional kiln (a tin kiln) intended for use by small farmers and gardeners, and 2) a laboratory muffle furnace, with the aim of evaluating biochar characteristics. Biochar produced in a muffle furnace and tin kiln has found similar physicochemical and adsorption properties at the same pyrolysis conditions. They include high pH, EC, CEC, Pava, Ca, Mg, K, and carbon content. We expect these biochars to have larger long-term effects on agricultural characteristics and soil carbon sequestration. However, the present results might be utilized to drive cleaner biochar production for agricultural use in developing nations, which may multiply local producer benefits.

First report of a rust disease of Lycium chinense caused by Puccinia tumidipes in Korea.

Lycium chinense Mill is a deciduous broad-leaved shrub belonging to the Solanaceae family and, is widely distributed throughout Korea. This plant is native to, or cultivated for various oriental medicinal purposes in, multiple regions of Asia, including Korea, China, and Japan (Lee 1982; Kim et al. 1994). Eleven Puccinia species have been reported to infect Lycium species (Otálora et al. 2018). In May and October 2022, symptoms of rust disease caused by Puccinia sp. were observed on almost all the leaves of about 60 sprawling stems of L. chinense plants on the seashore of Jeju island, Korea (33°14'15.0835″N, 126°30'53.40E). Brownish red (uredinium) or blackish brown (telium) pustules were observed on upper and lower surfaces of infected leaves. These symptoms were observed on about 40 L. chinense plants, barely growing between rocks on the seashore of Ulsan Metropolitan City, and on the about 20 L. chinense plants on a small home garden of Jindo-gun, Korea, in June and October 2023, respectively. Uredinia were amphigenous, individually scattered, but sometimes formed groups of two or three on leaves and sepals, ferruginous, pulverulent, and surrounded by a ruptured epidermis, often developing into blackish telia. Urediniospores were either ellipsoid or ovoid, approximately 29.3-34.9 × 17-24.3 μm, with yellowish walls, 1-2 μm thick. The germ pores were bizonate, and each band contained four pores covered by low papillae. Blackish-brown telia were observed on both leaf surfaces. Teliospores were broadly ellipsoidal, and rounded at the apex and towards the base. They were measured approximately 37.1-53.4 × 25-34.5 μm. The walls were light chestnut-brown and 2-3.7 μm thick, apically up to 5-9 μm thick. The swollen pedicel was persistent, basal, hyaline, smooth, and similar in length to the spores (Fig. 1). These morphological characteristics were similar to those of P. tumidipes, as described by Otálora et al. (2018). The representative specimens were preserved at the Animal and Plant Quarantine Agency Herbarium (PQK220531, -230605, and -231026). The fungal internal transcribed spacer (ITS2) and cytochrome oxidase subunit 3(CO3) regions were amplified from the total DNA of the isolates, using the primer pairs ITS5, ITS4, CO3F1, and CO3R1 for phylogenetic analysis (White et al. 1990; Vialle et al. 2009). PCR products were sequenced (Celemics, Seoul, Korea), and deposited in GenBank (Accession numbers are shown in Fig. 2.). The combined ITS2 and CO3 sequences were grouped with those of other isolates of P. tumidipes in the phylogenetic tree (Fig. 2). In November 2022, three pathogenicity tests were conducted using a urediniospore suspension made with the PQK220531 isolate in sterile distilled water. The suspension was smeared onto the upper surface of healthy L. chinense leaves. The three inoculated plants were kept in the dark at saturated moisture levels for 24 hours and placed in an isolated glasshouse together with the three control plants. After two weeks, uredinia of P. tumidipes were observed on the leaves of the inoculated plants, but not on the control plants. Although no spermogonial or aecial stage has been observed in Korea, our study has proven that P. tumidipes is the causal fungus of rust disease in L. chinense. This result is also the first discovery of the New-World P. tumidipes in Asia, showing this fungus is not limitedly distributed in America and suggesting further surveys be done on its exact geographical distribution.

An Economical Sensor-Based Automated Plant Watering System for Smart Irrigation

Lack of water results in a reduction in photosynthesis in plants and crops. Plants are significantly affected when the soil water level is depleted thereby resulting in low production in the agricultural sector which can lead to a reduction in food supply. This problem makes water supply and management highly necessary for plants to grow effectively. Over the past century, the rate at which water usage has increased globally has increased at a rate higher than that of population growth. Particularly in dry regions, an increasing number of regions are now using more water than they can sustainably provide. The traditional watering techniques, such as sprinklers and flood mode, are ineffective and those not supply the ideal needs of plants because some plants do not need excess water to grow. This also results in water wasting. These ineffective irrigation systems often provide habitat for organisms that carry illnesses. Research has established that excessive water spillage and stagnant water can be habitat for mosquitoes which can also be dangerous to human health. Therefore, watering plants must be done intelligently, by developing an intelligent system that can regulate the content of water needed to water a plant in accordance with their needs and the moisture content of the soil. This will also reduce the spillage of water. In this study, an automated plant watering system that monitors the soil's moisture level to determine when watering plants is necessary was developed using hardware components such as Arduino UNO (Microcontroller), soil moisture sensor, pump, relays, wires, sprinkler and software instructions to drive the hardware components. An economical watering system was designed. The system was tested and can be effectively used in small gardens and big crop fields.

Fishing damage to cloud sponges may lead to losses in associated fish communities in Pacific Canada

Glass sponge gardens are important biogenic habitats that support fish communities in Pacific Canada. However, glass sponges (class Hexactinellida) are delicate and susceptible to damage from fishing gear such as downriggers. In this study we document changes in a fish community before –and after damage from a presumed fishing event that resulted in a reduction of 58.9% of the available sponge habitat in a small cloud sponge garden in British Columbia. This habitat loss coincided with a decline of 76.9% of the relative abundance of rockfish, an economically important group of fishes, at the garden. This decline was particularly pronounced in small size classes with the disappearance of juvenile rockfish after the sponge loss. Although based on a single site, this is the first documentation of how anthropogenic damage in a sponge aggregation may impact the associated fish community. Damage from fishing gear is likely most pronounced in small sponge aggregations, like nearshore gardens, where a single event may result in a disproportionately large loss of available fish habitat. Slow regrowth of sponges suggests the habitat availability may be permanently altered at these sites and can coincide with shifts in the localized fish community that may be long lasting on a local scale. Currently sponge gardens do not have any direct spatial protections in the Pacific Northwest, and this work highlights the importance of considering them in future protection initiatives.

Securing agropastoral system and rural livelihood through the market garden in Niger: unfolding smallholders’ resilience to interwoven challenges

Market gardens in Niger are a crucial tool for securing agropastoral systems and rural livelihoods amid interwoven challenges such as climate change, conflicts and insecurity, demographic pressure and poverty. A study of 60 small garden farmers found that market gardens significantly enhance farmers’ income and household food security. The average annual income from market gardens is 126.51 USD, accounting for 70% of total income. However, challenges like water scarcity, land insecurity, and limited access to credit and markets hinder their full socio-economic role. The farmers try to overcome those obstacles through cooperation, sending remittance from part-time off-farm activities, and mobilisation of resources based on their social capital. Those who could not overcome the challenges left the village for a ‘safer’ location. The study emphasises the need for community collective action, rural-urban networking, and external support to improve market gardens for rural poverty reduction and food security improvement.

Unveiling the urban colonization of the Asian water monitor (Varanus salvator) across its distribution range using citizen science.

This study aims to investigate the urban colonization of the Asian water monitor (Varanus salvator) across its entire range of distribution, addressing the paucity of research on this species in urban ecosystems. The research spans the geographic range of the Asian water monitor, focusing on urbanized areas where the species accumulates more observations (Bangkok, Colombo, Jakarta, Kuala Lumpur and Singapore). We conducted a systematic review to comprehensively assess the current knowledge of the species' presence in cities. Additionally, citizen science data from repositories like GBIF (Global Biodiversity Information facility ) were utilized to analyze the distribution patterns of V. salvator in urban environments. To elucidate urban distribution and correct collection biases, observations were weighted by sampling effort, using as a proxy all squamate occurrences available from 2010-2023, including V. salvator. Despite the widespread presence of the Asian water monitor in numerous cities within its distribution range, the available studies on the topic appear to be scarce. Existing research primarily consists of descriptive reports on diet and behavior. Our findings indicate that V. salvator predominantly colonizes green patches in urban areas, such as parks and small gardens. Larger cities exhibit higher records, potentially due to both permanent populations and increased citizen science reporting. The Asian water monitor, as the largest lizard with established populations in cities, remains scarcely studied on a broader scale. However, the urban design of each city seems relevant to understand the distribution patterns within each context. Our study highlights the need for further research to explore the ecological and human dimensions associated with the species' presence in urban environments.

Consumer Knowledge of Garlic for Nutrition Education Programming

Garlic intake has been the subject of research for its many potential health benefits. Consumers have continuing interest in food-related topics, food preparation, and growing their own food in small gardens. Garlic has specific agronomic protocols because it is not grown simply from seed. As a culinary aromatic, garlic use may be somewhat mystifying for some. This research study used an online consumer survey with 558 participants to determine basic garlic consumption habits, knowledge of the research related to health benefits of garlic, experience with and interest in growing garlic, and some basic demographic information. The top reason for using garlic, at 64% of responses, was ‘cardiovascular’ benefits, followed by ‘anti-bacterial’ at 45% and ‘blood pressure support’ at 37%. Only 3% of respondents reported that they were currently taking garlic supplements. The top two preferred garlic forms used at home were ‘dried garlic powder’ and ‘fresh, raw garlic,’ at 86% and 83% respectively. We noted a budding interest in growing garlic for home harvest and in educational information, especially when available in online print and video formats. The survey results showed that more programming is needed to emphasize the health benefits of the natural phytochemicals (plant chemicals) contained in garlic as part of an overall balanced diet.

Adaptation of a Central Ukrainian Village to the Post-Soviet Reality (Exemplified by the Villages of Dmytrivka and Potaptsi in Kyiv and Cherkasy Regions)

The Ukrainians have always been distinguished by an active social position and initiative. But the collective farming network (kolhosps) imposed by the USSR communist authorities have brought the hardworking Ukrainians into a heavy distress. Country people have recovered from it until recently. After Ukraine has been announced an independent state it takes a long time for the villagers to release their typical traits of having an active social position and taking an initiative. Thus, in 1990s the so-called farmers’ movement has abated and country people stuck habitually to the almost disabled collective and state farms (kolhosps and radhosps). Finally, in the second decade of modern independence, suddenly the situation has started changing fundamentally in a rapid pace. This article is based on the field material collected in 2022–2023 and analyzed according to the guidelines of the neoevolutionists (Marshal Salins, Serhii Arutiunov, etc.) regarding the adaptability of culture. Two cases of at least the Ukrainian village beginning to revive are considerd. These are the large village of Dmytrivka (not far from Kyiv) and the small village of Potaptsi (100 km far in Cherkasy region). Even these two examples illustrate a real recovery of the Ukrainian village from the Soviet regime, with its destructive collective farming network. Thus, in the first case (the village of Dmytrivka) transformation of the village into a province in Kyiv region, albeit without the corresponding status is described. The residents have been no longer involved into an agricultural activity, instead they are employed at enterprises, small businesses and institutions in Kyiv and Dmytrivka. Only some of them have small vegetable gardens and homestead lands, so no one can call them peasants. In case of Potaptsi, here the concept of village is preserved completely as it is. The residents lease their plots of land to the two farmers, as well as cultivate large vegetable gardens and run fairly large homesteads. Country people no longer keep cows, instead they prioritize poultry and bee keeping and rabbit breeding. Two farms in the neighboring villages of Pii and Chernyshi are specialized in the production of dairy goods. In Dmytrivka, which is the center of the amalgamated territorial community, the village head Taras Didych, has taken a great effort to preserve, reform and develop most of the services and institutions that have been operating since the Soviet times (school, House of Culture, medical institution, etc.). Unfortunately, all the issues haven’t survived in the village of Potaptsi practically. However, despite this fact, the village is reviving, albeit on modern grounds, people revive ancient Ukrainian country practices, such as rural homesteading, beekeeping, fish farming, as well as farming at least. It is facilitated by the general rise of living standards in the state, the availability of various farming and household appliances, motor vehicles, and information technologies. The residents are coming back to the village, first of all, those who were born there. They leave apartments for their grown up children in Kyiv and Cherkasy and move to Potaptsi. Their relatives, as well as their children, often follow them. Even the war started by the Russian descendants of the creators of the Soviet collective farming network cannot hinder the process. The initiative and hardworking Ukrainian peasantry having an active social position is being revived.

Field and Student Evaluation of Green Spaces (Gardens) for Al-Mustaqbal University College \\ Hilla – Babylon Province

Al-Mustaqbal University’s gardens were assessed in 2022. The study had two phases: the field evaluation phase, which surveyed and analyzed green areas’ natural and material components. Student evaluation (questionnaire) is the second part. Green and their development goals. Field evaluation findings: 1-The absence of a clear design for the gardens, as it is a green area surrounded by trees and shrubs 2-The absence of a well-thought-out botanical design, where trees are planted at close distances without taking into account their future size. 3-Not allocating places for various activities such as isolated places for reading and relaxation, gathering gardens, and various student sports, recreational and social activities. 4-Dividing the large area into small gardens with spaces that are not suitable for any activity conducted by students, except for the garden of the College of Pharmacy and the College of Physical Education. 5-Walkways are designed with a width outside the design standards for pedestrians, and it may reach (8) m, which is the width of a street. 6-The lack of points of interest and interest such as statues, fountains, water bodies...etc. According to the student evaluation (questionnaire), (50.3%) thought the gardens were medium, (46.6%) preferred green spaces for their preferred plants, (68.4%) preferred wide gardens with all activities, and (49.2%) thought maintenance was moderate. Gardens and maintaining them, and (63.7%) desire to expand green areas and gardens since the present ones were insufficient. (62.1%) of students like natural aspects, (83.7%) like modern garden designs, and (45.3%) are near the department building’s garden. Medical, one of the university’s most important gardens, and (76.3%) wish to engage and express their opinion if any gardens are rebuilt.

First report of powdery mildew caused by Erysiphe corylacearum on hazelnut in Bulgaria.

In June 2020, during an observation of fruit-bearing hazelnut trees (Corylus avelana L., cv. Tonda Gentile), grown in a small private home garden in the region of Kavarna (North-Eastern Black Sea coast of Bulgaria), symptoms of powdery mildew were observed on each of the 15 trees. Compared to the widely spread in Bulgaria powdery mildew caused by Phyllactinia guttata and known with its powdery patches and differing chasmothecia exclusively formed on the abaxial leaf surface, the newly observed disease was characterized by the presence of concomitant pathogen's structures on both the abaxial and adaxial surfaces of the leaves, varying from single pustules to 90% severity on certain leaves, as well as on the husks which were 100% affected. Among the white mycelium, cylindrical conidiophores and singly produced conidia (22-34 x 16-22 µm; n = 50) were found. Scattered or in groups, black spherical chasmothecia (diameter of 85-115 µm; n = 30), possessing 8 to 12 appendages with dichotomous branched apices, were also observed in the autumn. Chasmothecia contained 3 to 5 subglobose asci (45-60 x 34-62 µm; n = 30), each ascus containing 8 hyaline and ellipsoid ascospores (15-22 x 9-16 µm; n = 50). From one field powdery mildew sample DNA was extracted using the Nucleospin Plant II kit (Macherey-Nagel, Germany) and the rDNA ITS region was amplified using primers PMITS1 and PMITS2 (Cunnington, J.H. et al., 2003). The amplicon was sequenced (Macrogen Europe, The Netherlands) and used in a BLAST analysis. This resulted in 100% homology with the ITS sequence of Erysiphe corylacearum. The obtained sequence was different from the ones of Erysiphe pseudocorylacearum (99.20% homology) and Erysiphe coryli-americanae (96.52% homology). The targeted sequence was submitted to GenBank (accession number OQ860748). Based on the symptoms, morphological characteristics and molecular identification, the pathogen was identified as Erysiphe corylacearum. Pathogenicity of the fungus was confirmed under lab conditions (natural day/light regime, 23-25°C) by shaking down conidia from naturally infected leaves on both sides of healthy leaves (2-years plantlets, cv. Tonda Gentile, 3 replicates) and incubation in a moist chamber (plastic bags) for the first 24 hours. First small fluffy white pustules appeared 6-7 days after inoculation, subsequently, the disease was progressing and the pathogen's conidiophores and conidia were morphologically identical to that first observed under natural infections in the private garden. The non-inoculated control plantlets (grown under the same conditions in a separate room) remained symptomless during the entire three weeks testing period. To our knowledge, this is the first report of Erysiphe corylacearum on hazelnut in Bulgaria. In October 2021, the same disease was also found in a hazelnut orchard (1.2 ha) located in the region of Pazardzhik (Central Southern part of the country). Globally, this report indicates the disease's expansion in the Black Sea region since its first observation in Turkey in 2013 (Sezer, A., et al. 2017; Heluta, V.P., et al. 2019; Meparishvili, G., et al. 2019; Rosati, M., et al. 2021) and elsewhere in Europe as well (Beenken, L., et al. 2020; Mezzalama, M., et al. 2021; Voglmayr, H., et al. 2021).

A closer look at residential water demand elasticities in the short and long run

Hotter, drier summers and population growth are causing water management challenges for water authorities in New Zealand. Effective long-term planning requires understanding the dynamics of household responses to demand management and climate variables. This paper analyses a large dataset of household-level demand data over nine years. Dynamic panel time series models are used to estimate short and long-term elasticities, interactions between demand management and climate variables, and associations with property characteristics. The general belief is that water demand becomes more sensitive to price changes over the long term compared to the short term. Yet, previous studies that directly compared long and short-run elasticities had limitations, as they imposed a constraint on the long-run estimate, assuming it to be larger. The models presented in this paper are more flexible and can identify the opposite scenario should it be present. We find long-run price elasticity may not be larger for new high-value properties or high-value properties with small gardens. Low-value properties have smaller short-run and larger long-run price elasticity. High-value properties respond more to outdoor restrictions and associated conservation messages than low-value properties. We discuss the policy implications of these findings.