Ulmus Research Articles

Health of elms and Dutch elm disease in Estonia

During three years, 2014–2016, Dutch elm disease (further DED) was investigated on 1225 elm trees at 4 different sampling sites and 2 sub-sites in Estonia. For the first time, both subspecies of the invasive pathogen Ophiostoma novo-ulmi: O. novo-ulmi subsp. novo-ulmi, and O. novo-ulmi subsp. americana, were detected by col1 and cu genes in Estonia and north-eastern Europe. Ophiostoma novo-ulmi subsp. americana was identified only at one site in northern Estonia, in Tallinn. In addition, during our assessments, the health of elms there appeared worse than at other sampling sites: O. novo-ulmi subsp. americana demonstrated higher aggressiveness. Simultaneous occurrence of both subspecies and their hybrids was not detected. A repeat survey of 109 elms in 2014 and 2016 demonstrated ca. 22% probability of mortality within 24 months, irrespective of urban vs. rural habitat. In sub-site A1 in Tallinn, O. novo-ulmi subsp. americana has been found since 2013. DED signs were noted on 39% of all 1225 surveyed trees. Among the assessed elm species, Ulmus laevis showed higher resistance than U. glabra: 82% and 66% of trees, respectively, showed high vitality. In addition, no U. laevis trees were found dead, compared to 18% of the U. glabra.

Pest categorisation of Scaphoideusluteolus.

The Panel on Plant Health performed a pest categorisation of Scaphoideus luteolus, a well‐defined phloem sap‐feeding insect species in the family Cicadellidae (Insecta: Hemiptera). It can be identified using taxonomic keys. S. luteolus is only present in the eastern part of the USA. The main host plants of S. luteolus are species of the genus Ulmus (U. americana, U. alata, U. bergmanianna, U. szechuanica, U. rubra), but specimens have also been collected on Vitis sp., Salix sp. and Populus sp. The species does not cause damage by itself, but it is the only confirmed vector of the phytoplasma Candidatus Phytoplasma ulmi (CPu), which is present in North America where it causes heavy damage to the local elms, as well as in some European countries where the local elms are considered less susceptible. S. luteolus has three developmental stages (egg, nymph, adult). It overwinters in the egg stage, takes 36–42 days to complete nymphal stage, and adults are found throughout the summer period. Both nymphs and adults are capable of transmitting CPu and, after acquiring the pathogen, remain infective for the rest of their life. The main pathways are cut branches and plants for planting. These pathways are not regulated for the main host, Ulmus, though requirements are in place in relation to other pests on Ulmus. These pathways are also not regulated for Salix. Establishment would be favoured by the wide coverage of Ulmus spp. in the EU territory and by climatic conditions comparable to those of the pest's native range. S. luteolus meets all the criteria assessed by EFSA for consideration as potential Union quarantine pest. The criteria for considering it as a potential Union regulated non‐quarantine pest are not met since the species is absent from the EU.

The complete chloroplast genome of Hemiptelea davidii (Ulmaceae), the only species of the genus Hemiptelea

Hemiptelea davidii (Hance) Planch is a potential valuable forest tree in China. Here, the complete chloroplast genome of H. davidii was reported using high-throughput sequencing technique. The chloroplast genome is 160,195 bp in length, contains a pair of inverted repeat regions (IR, 26,599 bp), which were separated by a large single copy region (LSC, 88,231 bp) and a small single copy region (SSC, 18,766 bp). The GC content of the whole chloroplast genome is 35.28%. The chloroplast genome comprises 111 unique genes, including 77 protein-coding genes, 30 tRNA genes, and four rRNA genes. Phylogenetic analyses of 17 chloroplast genomes indicated that H. davidii is close with Zelkova and Ulmus species in Ulmaceae but little far from the species in Cannabaceae, Moraceae and Urticaceae.

First report of ‘Candidatus Phytoplasma rubi’ on blackberry in Belgium

In May 2018 stunted blackberry plants were observed on a small-scale organic farm producing several small fruit types in West Flanders, Belgium. Besides severe stunting, leaf yellowing and distortions could also be observed (Figs. 1-2). Only Rubus fruticosus plants of the cultivar Obsidian showed symptoms but disease incidence was estimated to be almost 100%, of which almost half the plants were stunted. Other cultivars did not seem affected. Seven symptom-bearing plants, of which four had severe stunting, and three only leaf symptoms, were sampled and tested. Additionally, three symptomless plants from neighbouring rows and belonging to different cultivars, were tested. All samples consisted of leaves and roots, and tests were conducted on a pooled leaf/root sample. Total genomic DNA was extracted by a CTAB protocol. The 16S rRNA gene was partially amplified using the phytoplasma universal primer pair P1/P7 (Deng & Hiruki, 2; Schneider et al., 5) followed by a nested PCR with R16F2/R2 primers (Lee et al., 3) as a diagnostic test, and P1/Tint primers (Smart et al., 6) on positive samples for sequencing. All of the diseased plants tested positive for phytoplasma in nested PCR tests. Additionally, specific phytoplasma group V primers targeting the tuf (FDTUF-F1/R1 & FDTUF-F2/R2; Malembic-Maher et al., 4), and secY (primer sets FD9f2L/FD9r & FD9f3L/FD9r2L; Arnaud et al., 1) genes were used in nested PCRs and yielded fragments of 998 and 1174 bp respectively. The obtained 16SrRNA (P1/Tint), tuf and secY fragments were gel purified (SmartPure, Eurogentec), and sequenced directly (Genewiz, Leipzig, Germany). BLAST analysis of the 16SrRNA sequence, revealed the highest identity (99.85%) with a ‘Rubus stunt phytoplasma’ strain from blackberry (R. fruticosus) in Italy (isolate RuS400; GenBank Accession No. AY197649). Partial sequence of the 16S ribosomal RNA (1607 bp), and tuf (835 bp) and secY (1053 bp) genes were submitted to GenBank (MH801133, MH809672 and MH809673, respectively). Phylogenetic analysis was undertaken on all three fragments, and the phytoplasma was identified as ‘Candidatus Phytoplasma rubi’, ‘elm yellows’ group 16SrV-E (Figs. 3-5). To our knowledge, this is the first report of ‘Ca. P. rubi’ on blackberry in Belgium. An additional nationwide survey is needed to assess the phytopathological impact of this outbreak. Although a growing number of reports indicate the increased importance of Rubus stunt, associated with ‘Ca. P. rubi’, unlike the related ‘Ca. P. ulmi’, associated with elm trees, no regulatory actions are currently taken against this pathogen.

First report of Meloidogyne mali causing root galling to elm trees in the UK

In October 2018, infective juveniles of Meloidogyne mali were isolated from a soil sample taken from the rhizosphere of elm trees (Ulmus sp.) located at one site in southern England. This surveillance work was carried out by the Plant…

Peer review of the pesticide risk assessment of the active substance Verticillium albo-atrum strain WCS850.

The conclusions of EFSA following the peer review of the initial risk assessments carried out by the competent authorities of the rapporteur Member State Sweden and co‐rapporteur Member State the Netherlands for the pesticide active substance Verticillium albo‐atrum strain WCS850 are reported. The context of the peer review was that required by Commission Implementing Regulation (EU) No 844/2012. The conclusions were reached on the basis of the evaluation of the representative use of Verticillium albo‐atrum strain WCS850 as a fungicide on elm trees. The reliable end points, appropriate for use in regulatory risk assessment, are presented. Missing information identified as being required by the regulatory framework is listed.

Phytoplasma survey in Ulmus species in Belgium

Phytoplasma survey in <i>Ulmus</i> species in Belgium

Investigating composting progress of kitchen wastes using rate of change and cross-correlation approaches

Kitchen wastes usually require addition of some bulking agent for proper composting. In this study, mixtures of kitchen and pruning of elm trees were composted under three treatments of natural, low and high aeration rates. Temperature, ammonia, carbon monoxide, pH and volatile organic matter were monitored and analysed. The results indicated with increase in aeration rate, temperature of the treatments increased. The pH values of the treatments decreased initially to a minimum of 5.0 and then increased continuously. The emitted ammonia and CO initially rose but then continually decreased. The rate of change graphs showed two distinct phases of: 1) active; 2) constant rate for all measured factors. A correlation analysis on the five considered factors indicated the reduction in volatile organic matter and emitted CO and ammonia were highly negatively correlated with pH of the pile (r = −0.72), but their correlations with temperature were low.

Occurrence of ‘Candidatus Phytoplasma ulmi’ in native elm trees in Germany

A countrywide survey has been performed to examine the occurrence of the elm yellows phytoplasma in three elm species native to Germany. The DNA of more than 5, 000 trees was extracted and the presence of phytoplasmas verified by universal and pathogen-specific quantitative PCR assays. In total, 33% of all plants resulted phytoplasma-positive. The highest presence was found in the European white elm, followed by the wych elm and the field elm. Regional clusters of high incidence were found in east and in south-west Germany, while in the western states the phytoplasma presence was low or absent. Disease symptoms were only occasionally visible as witches’ broom for wych elm and yellowing and small leaves for field elm. The survey revealed that ‘Candidatus Phytoplasma ulmi’ is widespread in Germany questioning the current quarantine status of this pathogen.

Особенности семенного возобновления ulmus pumila l. на стихийно законсервированных пахотных землях в степной зоне Хакасии

In the 90s of the last century, the volume of spontaneous conservation of arable land in Central Siberia amounted to 1.1 million hectares. Unproductive land with forest melioration facilities, which are used as pastures, underwent spontaneous conservation. Currently, there is an active overgrowing of fallow fields with elm trees and shrubs. In order to use forest forests effectively, it is necessary to remove excess tree-shrub vegetation. Studies of the characteristics of the seed renewal of Ulmus pumila L., growing on spontaneously conserved, highly degraded lands used as pastures, were carried out in 2013–2017. in the steppe zone in the territory of Khakassia. The term conservation of arable land is 17 years. Conditions for the growth of natural renewal Ulmus pumila adverse. 47% of the undergrowth of Ulmus pumila belonged to the category of sanitation - weakened. The main part, 73%, of the undergrowth was small and did not exceed 50 cm in height. On interband lanes, natural renewal was unevenly distributed. On the leeward side of the parental forest shelter belts at a distance of up to 20 m, 65% grew; on the windward side at the same distance - 18% of all existing Ulmus pumila. The optimal size of Ulmus pumila at the age of 10 years was from 1.0 to 2.5 thousand units per hectare, since with these indicators the maximum productivity of grass stand was obtained - 12.7 kg per hectare of air-dry mass. In order to increase the productivity of the grass stand at the forest pasture, it is necessary to carry out a radical improvement in the destruction of excessive shrub vegetation. Woody plants of less than 2.5 thousand units per hectare should be left on the fields, provided that they are evenly distributed over the territory so that Ulmus pumila, having reached its adult state, forms plantations with optimum crown density, which should not exceed the value of 0.2.

First report of the main vector of Dutch elm disease Scolytus multistriatus (Marsham, 1802) on elm and poplar trees in Lebanon (Coleoptera, Curculionidae, Scolytinae)

First report of the main vector of Dutch elm disease Scolytus multistriatus (Marsham, 1802) on elm and poplar trees in Lebanon (Coleoptera, Curculionidae, Scolytinae)

Measurement and evaluation of timber yields and corresponding non-timber forest products of selected tree species. An exploratory study on Poplar, Acacia, Ulmus and Juglans tree species in Kyrgyzstan. An exploratory study on Poplar, Acacia, Ulmus and Juglans tree species in Kyrgyzstan

Measurement and evaluation of timber yields and corresponding non-timber forest products of selected tree species. An exploratory study on Poplar, Acacia, Ulmus and Juglans tree species in Kyrgyzstan. An exploratory study on Poplar, Acacia, Ulmus and Juglans tree species in Kyrgyzstan

Miocene Ulmus fossil fruits from Southwest China and their evolutionary and biogeographic implications

The genus Ulmus L. (Ulmaceae) has a rich Cenozoic fossil record from the Northern Hemisphere, which provides essential information for evolutionary and biogeographic histories. However, compared to its abundant leaf fossils, fruit fossils of Ulmus, which allow accurate identification, are still scarce. In this study, we report two new species of the section Ulmus, Ulmus prelanceaefolia Q.Y. Zhang et Y.W. Xing sp. nov. and U. maguanensis Q.Y. Zhang et Y.W. Xing sp. nov. from the Miocene Huazhige Formation in Wenshan and Maguan basins, southeastern Yunnan, southwestern China. These two species are established based on several well-preserved fossil samaras. Ulmus prelanceaefolia represents the only unequivocal record of the ser. Lanceaefolia in the world and U. maguanensis represents the earliest unequivocal record of the ser. Nitentes in East Asia. The evolutionary and biogeographic histories of Ulmus are discussed by summarizing and revising the fossil fruit records. We deduce that the narrow-winged fruit may be primitive and the two narrow-winged sections, sect. Chaetoptelea and Trichoptelea are the early evolved lineages in Ulmus and have diversified since the Eocene. The Oligocene was an important epoch for the rapid diversification of broad-winged lineages of Ulmus, which was likely due to dispersal advantage in the more open forests originating as the global climate began to cool. We also found frequent exchanges/dispersals and extinction events between or within North America, Asia, and Europe since the Eocene. The North Atlantic and Bering Land Bridges served as important dispersal corridors for Ulmus during the Cenozoic.

Composting

Composting Austyn Gaffney (bio) In the five years between when I left and returned to Virginia, of the fifteen jobs I held, at least a third involved petals. Every time I stripped a zinnia of its leaves, the smell of milky chlorophyll and compost slipped me back to that first fall when I was twenty-one, an intern at a flower farm in a shallow valley east of Shenandoah. In that era, I woke to cold in an old farmhouse. It was haunted though I only heard creaks and never moans. Beyond my bedroom window, fog settled into the drainage slopes between hoop houses, in the roots of oak trees and maple trees and elm trees, as a blanket over the straight beds of blooms. I'd stretch up from my pillow and put my socked feet onto a sloping wood floor. The house was tilted atop a foundation laid in 1742. I walked down a back staircase. I shuffled into the living room, a space of musty rugs and armchairs, vases of fresh and decaying flowers, the smell of propane from the fake stack of wood in the stone fireplace. The kitchen on the other side of the doorway had a string of lights across the four-tiered windowpanes. They pointed toward the coffeepot. Smells are watch-towers for memories: propane, caffeine, chlorophyll. The last time I woke up in the farmhouse, it was next to a man who I dragged there when his job as a park ranger in Kentucky ended. We had been dating for a few months, and we had dated a few times before. I followed him through my four years of college like a weak shadow, like one closing in on dusk. He was perpetually tanned, a speckled piece of amber, with thick eyebrows that furrowed together with questions and opened wide when he laughed. He had a sweet mouth and calloused hands. He wore the same t-shirts from Goodwill the four years I knew him, and when he met my parents it was in a Christmas sweater of knitted cats. His uniform was flannels and baggy jeans and sandals, and he was convinced that if he swore off deodorant his armpits would stop smelling. He was musky. I was very young, and I loved him as faithfully as I loved that house. [End Page 152] Now, five years later, I pull up to the farmhouse on a clear night in May, after an eight-hour drive from my home in Kentucky. I push open the screen door to the kitchen. Its smell pummels me. It contains memories so pungent that they open like a spigot. It is half a decade since I woke to make oatmeal in this yellow room, since I heard the rooster announce dawn. I used to spend evenings chasing that old rooster at twilight with just the light of my headlamp to get it in its coop. I raged that as I protected him from foxes or coyotes, he threatened me with menacing spurs four inches long. But I spent much of my time that fall chasing things that didn't want to be caught. I'm told the rooster died years ago. It's a comfort that some things are the same. My daily retreat is still the outdoor shower. Its wooden planks of sunken pine smell like my childhood spent sunbathing on docks over cold lakes. A smell dim and heady and almost molding. It's the same smell in the bushes of viburnum or the trees of styrax—something decomposing in the weight of its sweetness. This humid decay is one of my favorite smells, the ephemeral space between fragrance and rot. ________ This time, instead of early fall it is early summer. The zinnias are still in their seed trays. I start work by watering the greenhouse. I pinch the Oklahoma Sunrise, already shooting up peach buds. The hose showers over them. I worry about them blooming too early, miniature in a too small cell. They are beginning to blossom tight and tiny like the choked shape of a bonsai tree. I too feel oddly small my first few days on the farm. It...

Micropropagation and regeneration of Ulmus parvifolia Pathfinder, the Chinese elm tree

Micropropagation and regeneration of Ulmus parvifolia Pathfinder, the Chinese elm tree

Study of bark Ulmus carpinifolia elemental composition in comparison with elemental composition of the soil

Topicality. Continuing to study the promising species of Ulmus, which are common in Ukraine, we studied the bark of Ulmus carpinifolia elemental composition in comparison with the soil.Aim. To study the bark of Ulmus carpinifolia elemental composition, family Ulmaceae in comparison with the soil.Materials and methods. The raw materials harvested at the exhibitions in the Botanical Garden of V. N. Karazin Kharkiv National University. Elemental composition determined by the method of atomic emission spectrography with photographic recording of results on the device DFS-8 in comparison with standard mixtures of mineral compounds.Results and discussion. The analysis showed the presence of 17 macro- and microelements identified and determined in raw material, among them there are 4 macro- and 13 trace elements. For the bark, the following pattern of accumulation of macroelements were observed: K &gt; Si &gt; Ca &gt; Na &gt; P, trace elements Fe &gt; Al &gt; Mn &gt; Zn &gt; Cu &gt; Mo &gt; Pb &gt; Ni &gt; Co &gt; Cd &gt; As &gt; Hg. In soil, macroelements accumulated in the following order: K &gt; Si &gt; Ca &gt; Na &gt; P and trace elements in the following: Fe &gt; Al &gt; Mn &gt; Zn &gt; Cu.Conclusions. The results of study the elemental composition of Ulmus carpinifolia bark and soil under this plant were showed. The presence of 17 macro- and microelements was determined , the high content of potassium, calcium and silicon in feed and in soil was proved.

Tree Vitality Assessment in Urban Landscapes

The recent prolonged drought in Melbourne, Australia has had a deleterious effect on the urban forest, resulting in the premature decline of many mature trees and a consequent decline in the environmental services that trees are able to provide to urban residents. Measuring the severity of tree stress and defoliation due to various climatic factors is essential to the ongoing delivery of environmental services such as shade and carbon sequestration. This study evaluates two methods to assess the vitality of drought stressed Elm trees within an inner-city environment—bark chlorophyll fluorescence measured on large branches and an urban visual vitality index. Study species were Ulmus procera Salisb. (English Elm) and Ulmus × hollandica (Dutch Elm), which are important character and shade tree species for Melbourne. Relationships were identified between leaf water potential and the urban visual vitality index and between leaf water potential and bark chlorophyll fluorescence measured on large branches, indicating that these methods could be used to assess the effect of long-term drought and other stressors on urban trees.

Modeling the invasiveness of Ulmus pumila in urban ecosystems in conditions of climate change

Climatic change can influence the boundaries of the natural and alien plant species distribution. Fluctuations in air temperature, relative humidity and other factors can become a stimulus to initiation and / or intensification of the invasive nature of some adventive plant species, especially in areas with a high degree of anthropogenic transformation. This paper presents an analysis of the current state and a forecast of the invasiveness of the alien species Ulmus pumila L. (Asiatic elm) in the Northern Steppe Dnieper under conditions of climatic change. Two local U. pumila populations consisting of young different age trees were found during a route survey in the territory of the large industrial city Dnipro (48°28′00″ N, 35°01′05″ E) in its left-bank and right-bank parts.The seed origin of both local populations of Asiatic elm is confirmed by the fact that the young plants were spaced at a distance of 50 to 120 m from adult trees, which could potentially be parent plants. Both the left-bank and right-bank populations of U. pumila were located on abandoned construction sites, where there were numerous reinforced concrete slabs, piles and abundant construction debris. In both U. pumila local populations, 100 different-aged trees were randomly selected throughout the site, and their age and the morphometric parameters were measured to simulate the development process of the detected populations, provided the current trends of climate change continue. Analytical dependence of the number of trees in the left-bank local U. pumila population on development time was described by a polynomial model with a determination coefficient of 98.3%. The graphic representation of this model had a sinusoidal character, and a similar dynamic of left-bank population growth in the subsequent years was suggested. The dynamic of the number of trees in the right-bank local Asiatic elm population was described by an exponential model with a determination coefficient of 84.4%, and its graphical representation was exponential. According to the forecast, by 2020, the number of plants in the right-bank local population of U. pumila can increase 4-fold in comparison with 2015 while maintaining the current dynamic of population development. Thus, the created mathematical models adequately described the dynamics of development of both local populations during the last 15 years and predicted their subsequent intensive growth, confirming the initiation and intensification of the invasive nature of the alien species U. pumila by climatic change in the Steppe Dnieper.

The effect of galling aphids feeding on photosynthesis photochemistry of elm trees (Ulmus sp.)

Changes of chlorophyll (Chl) a fluorescence and photosynthetic pigment contents were analysed in galled leaves (visibly damaged and undamaged parts) and intact leaves. The values of minimal fluorescence of the dark-adapted state, maximal quantum yield of PSII photochemistry, effective quantum yield of PSII photochemical conversion, and photochemical quenching coefficient decreased in Ulmus pumila L. leaves galled by Tetraneura ulmi (L.) and in U. glabra Huds. galled by Eriosoma ulmi (L.). Colopha compressa (Koch.) feeding affected these parameters only in damaged parts of U. laevis Pall. galled leaves. The increasing number of T. ulmi galls progressively decreased photosynthetic performance. In gall tissues of all analysed aphid species, the lowest photosynthetic pigment content was found, indicating that the photosynthetic capacity must have been low in galls. Significant reduction of Chl and carotenoid contents were observed in damaged and undamaged portions of galled leaves only in the case of T. ulmi feeding.

First Report of Desarmillaria tabescens Found on Ulmus pumila in South Korea

In November 2013, basidiomes of Desarmillaria sp. were observed at the base of a single Ulmus pumila L. (Siberian elm) tree planted along the street nearby the main gate of the National Institute of Forest Science, Seoul, South Korea (37°35′29.46″N, 127°02′32.74″E, elevation 28 m). Bark and basidiome samples were collected from this tree, which was suspected of having been associated with Armillaria root disease. Symptoms and signs, respectively, included crown thinning and a mycelial fan between the bark and wood of the trunk of the tree, roots of the tree, and basidiomes at the tree base. No rhizomorphs were formed. Since the first detection where basidiomes of Desarmillaria sp. were observed on U. pumila in November 2013, the tree was subjected to be monitored, and was felled for safety in June 2017. U. pumila, native to Central Asia, eastern Siberia, Mongolia, Xizang (Tibet), northern China, India (northern Kashmir), and Korea (Fu and Whittemore 2002), is a commonly planted street and shade tree in South Korea and is widely distributed across the country. Fungal isolations (CFPR-UP14AT:1 and 2) were directly made from the mycelial fan and basidiomes produced on the tree, and were deposited at the culture collection (CFPR) of the Forest Pathology Research Laboratory, National Institute of Forest Science, Seoul, South Korea. Genomic DNA was extracted using the isolate CFPR-UP14AT:1. The intergenic spacer-1 (IGS-1) region of rDNA was amplified with the primers LR12R (5′-CTGAACGCCTCTAAGTCAGAA-3′) and O-1 (5′-AGTCCTATGGCCGTGGAT-3′), and sequenced. The resulting sequence was deposited in GenBank (accession no. KT004513). A BLAST search in GenBank revealed that the xsequence from U. pumila was 99% identical (100% query cover) to Desarmillaria tabescens (Scop.) R.A. Koch & Aime sequences reported from Japan (AB510824.1, AB510839, and AB510823). Somatic pairing tests of the isolate with other Korean armillarioid species, including Armillaria mellea (CFPR-AME5), A. ostoyae (CFPR-AOS6), D. tabescens (CFPR-ATA3), and A. gallica (CFPR-AGA5), also confirmed that the species is D. tabescens (syn. A. tabescens). In addition, basidiomes produced on the trunk base in 2014 matched morphological features of D. tabescens, e.g., exannulate, cespitose growth in clusters, brown-gray stipes turning blackish toward the base, longitudinally fibrillose, basidiospores (6-) 7 to 9 × 4 to 5 (-5.5) μm. On the basis of these features, particularly the absence of rhizomorphs, the identity of the fungus isolated from U. pumila was ensured as being D. tabescens (Burdsall and Volk 1993; Koch et al. 2017). D. tabescens–Ulmus associations were only recorded in North America (Farr and Rossman 2018). In this regard, this is the first confirmed report of D. tabescens found on U. pumila in South Korea. In addition to the present report of D. tabescens on U. pumila, the fungus was previously reported as a causal agent of Armillaria root rot of Acer tataricum, Carpinus tschonoskii, Pinus densiflora, Prunus salicina, and Quercus sp. in South Korea (Lee and Seo 2016) as well as Eucalyptus spp. and Prunus dulcis in Europe and Araucaria araucana in Mexico (Farr and Rossman 2018), although, in most cases, the fungus is considered a saprophyte colonizing the stumps of trees. Given the fact that D. tabescens is occurring on U. pumila, more surveys and monitoring are needed to determine the occurrence of the fungus as a pathogen on U. pumila trees.