Degree Of Infestation Research Articles

Гельминтозы пищеварительного тракта овец в степной зоне Забайкалья

The infection of sheep with helminthiases of the digestive tract in the steppe zone of the Trans- Baikal Territory, the species composition of parasites and the degree of infestation by them were studied. Based on the results of complete helminthological dissections (PHV) and incomplete helminthological dissections (IGV), 20 species of helminths were collected and identified, of which 2 species belong to the cestode class and 18 species belong to the nematode class. The most common helminthiases are nematodirosis, ostertagiosis, trichostrongylosis, strongyloidiasis, and bunostomiasis, esophagostomiasis, and chabertiosis were found much less frequently. In some farms, strongyliasis of the digestive system is very widespread, affecting sheep with an extensiveness of invasion (EI) up to 96,7 %, and moniesiasis infects with EI up to 60,2 %.

Совместное влияние Bacillus thuringiensis B-5351 и салициловой кислоты на устойчивость растений картофеля к Phytophthora infestans и урожайность в полевых условиях

Bacillus thuringiensis are the most common biological insect pest control agents. Some strains of B. thuringiensis are capable of endophytic existence, but the mechanisms of their interaction with plants and the role of phytohormones in this, for example, salicylic acid, which plays a key role in the development of plant immune responses against pathogenic microorganisms, have not been studied. When potato plants were treated with the endophytic strain B. thuringiensis B-5351 and salicylic acid simultaneously, an increase in the number of living bacterial cells in the internal tissues and a more than two-fold reduction in the area affected by late blight on the leaves was observed, relative to the control and action of B. thuringiensis B-5351 separately. The increase in plant resistance was accompanied by the accumulation of transcripts of the gene AY089962encoding the proteinase inhibitor and the activation of its protein product, which was more significant than after individual treatments. Under the field conditions (2020-2021), the treatment of plots with B. thuringiensis B-5351 alone did not reduce the degree of leaf spots infestation, however, in combination with salicylic acid, this indicator decreased by 20-25%. In 2020, the joint treatment of plants led to an increase in the total yield by an average of 20% relative to the control plots, as well as the yield of marketable tubers of the >80 g fraction. In 2021, only the treatment with salicylic acid led to an increase of total yield, but when combined with B. thuringiensis B-5351, the mass of large tubers increased.

Natural parasitism in fruit fly (Diptera: Tephritidae) and interaction with wild hosts surrounding apple orchards adjacent to Atlantic Forest fragments in Paraná State, Brazil.

The South American fruit fly, Anastrepha fraterculus (Wiedemann, 1830) (Diptera: Tephritidae), is an important pest in the subtropical region of Brazil. This insect has tritrophic relation between wild fruits and parasitoids and is associated with apple (Malus domestica Borkh.) orchards adjacent to the Atlantic Forest in Paraná. We thus investigated the degree of infestation of the fruit fly and natural parasitism in wild and cultivated fruits surrounding apple orchards. For this purpose, we collected fruits of Acca sellowiana (Berg.) Burret, Campomanesia xanthocarpa (Mart), Eugenia uniflora L., Eugenia pyriformis Cambessèdes, Psidium cattleianum Sabine, Psidium guajava (L.), Annona neosericea Rainer and Eriobotrya japonica (Thumb) in apple orchards adjacent to the Atlantic Forest located in Campo do Tenente, Lapa and Porto Amazonas counties. In total, we collected 18,289 fruits during four growing years. The occurrence of A. fraterculus depends on the susceptible period of apple fruits. A. sellowiana and P. cattleianum were considered primary fruit fly multipliers and P. guajava was secondary, all occurring after the apple harvest (IS period). The group of parasitoids with A. fraterculus was Aganaspis pelleranoi (Brèthes, 1924) (Hymenoptera: Figitidae), Opius bellus (Gahan, 1930), Doryctobracon areolatus (Szépligeti, 1911) and Doryctobracon brasiliensis (Szépligeti, 1911) (Hymenoptera: Braconidae) all of which are first records in the Atlantic Forest in Paraná. First record of O. bellus occurring in the State of Paraná, as well as, first record of the tritrophic association between host plant A. neosericea, parasitoids D. areolatus and O. bellus and fruit fly A. fraterculus. The host P. cattleianum stood out among the Myrtaceae species in regard to the high diversity of parasitoid species (81% of parasitoids). The total number of Figitidae species (76.5%) was higher than that of Braconidae species. The influence of climatic events in southern Brazil on wild fruit production should be further studied to understand the association of A. fraterculus with the tritrophic relationship.

Preserving the Danube Limes in Serbia: A review of the biodeterioration of Trajan’s Bridge

One of the most significant monuments of the Roman Danube Limes is Trajan?s Bridge, built in the period from 103 to 105 AD. The remains of the pillars on the Serbian bank of the Danube were partially restored four decades ago. Today, the pillar that is closest to the river, which has not undergone conservation, is subject to different types of deterioration. During the comparison between the present condition of the pillar and those recorded in photos over the last six decades, we can estimate that its level of material loss has not overly changed. However, the difference in biological growth is visible. The primary aim of this study was to record the degree of infestation and endangerment of the monument and check for possible risks of mortar deterioration where mortar is in direct contact with severely infested bricks. Moreover, a characterisation of the biodeteriogens was performed. Special emphasis was given to fungi as the main agents of deterioration. A precise assessment of the level of risk they pose to this monument was made as a basis for the formulation and implementation of appropriate conservation treatments. Severe macrofouling by epilithic lichenised fungi and mosses was documented. Even areas where pillars lack visible infestation, thriving microbial communities characterized by the presence of various fungal structures, as well as structures of trichal Cyanobacteria, and Chlorophyta were recorded. Similarities between communities documented on brick, mortar, and stone surfaces, estimated via S?rensen?s quotient of similarity, were high, with the highest similarity documented between mortar and stone.

Some characteristics of woody plants inhabited by Viscum album (Santalaceae) in the city of Kyiv

As a result of the study, a wide range of tree species parasitized by white mistletoe (Vіscum album) in the city of Kyiv, Ukraine, was identified. Some species, such as Quercus robur, Ulmus pumila, and Alnus glutinosa, remained uninfested even in the case of a high degree of infestation of surrounding trees. It has been found that among the infested plants only 4.34% of deciduous species and 5.05% of conifers demonstrated a severe damage caused by the hemiparasite (more than 20 plants of V. album in one crown). The largest number of trees and the highest level of damage were observed for Acer saccharinum, A. platanoides, Salix alba, Robinia pseudoacacia, Populus nigra, Tilia cordata, and Betula pendula aged in average 45–50 years. In the study of genetic characteristics of affected and unaffected by V. album trees of Pinus sylvestris at the molecular level by TBP markers, no differences have been revealed.

The need for alternative pest management methods to mitigate risks among cocoa farmers in the Volta region, Ghana

The objective of this study is to assess the adoption of alternative pest management methods to reduce risks among cocoa farmers in the Volta region. Cultural control methods found to be the most practiced alternative pest management, especially in the Ho West district where majority of the farmers were more knowledgeable of alternative pest control methods. There was significant relationship between agrochemical shop services (χ2 = 13,028, p < 0.000), farming years of experience (χ2 = 16.424, p < 0.002), knowledge in degree of pest infestation (χ2 = 8.498, p < 0.000), education (χ2 = 10.557, p < 0.014), farmers' community (χ2 = 39.275, p < 0.000) and farmers’ knowledge on alternative pest control methods. Farmers who relied on agrochemical shop services for pest control methods were 87% less likely to be knowledgeable on alternative pest control methods while those who considered degree of pest infestation in pest management were (OR = 1.150, p <0.008) more likely to be knowledgeable on alternative pest control methods. For the socio-cultural factors, Leklebi Kame (OR = 9.53-e 08, p < 0.000), Bla (OR = 0.280, p < 0.027) and Gbledi Chebi (OR = 0.287, p < 0.053) were less likely to be knowledgeable on alternative method of pest control compared to Kpedze. Fellow farmers and extension agents were the major sources of information on alternative pest control methods in the study area. Economic, technical, unavailability of labour, and farm implements were factors hampering adoption of alternative pest control methods in the study area. The most pesticide toxicological symptom reported was skin irritation and was recorded among majority of the farmers in Hohoe and Afadjato South districts where low knowledge and patronage of alternative pests control methods were identified. Awareness creation and capacity building programs should be organized through fellow farmers and extension agents on the need to reduce the use of chemical pesticide in pest management.

Evaluation of propiconazole, a triazole-containing fungicide as an inhibitor of strigolactone production

The inhibitory effect of propiconazole on strigolactone (SL) production and Striga hermonthica emergence were evaluated using rice plants. A significant reduction in SL levels was detected in root and root exudates after rice was treated with different doses of propiconazole. Propiconazole induced second tiller bud outgrowth in rice seedlings. In accordance with the results of 4-deoxyorobanchol levels in root and root exudates, propiconazole-treated rice attenuated the degree of infestation of the root parasitic weed, S. hermonthica. Overall, these results suggest that propiconazole has potential as a plant growth regulator for agriculture and a new scaffold for developing potent inhibitors of SL production.

Determination of the degree of helminth infestation of the ecaudate amphibians (the Anura: Ranidae, Bufonidae) depending on the biotic factors in conditions of the Republic of Moldova

In this study is made an ecological analysis of the species composition, structure of the helminth community and the invasion degree of Ranidae and Bufonidae families in different habitats in Moldova. As a result, it has been established the presence of 17 helminths species. It was found that the diversity of helminth fauna of the studied amphibians is structured depending on the host species, biotop, biotic factors, gender and depending of the host onthogenesis. Thus, the greatest diversity of helminthes in amphibians in the family Ranidae was established in Rana ridibunda and Rana lessonae with 17 species, and for the species from the Bufonidae family, no different values were established, so each host species being infested with 3 species of helminthes.

Multiclass insect counting through deep learning-based density maps estimation

The use of digital technologies and artificial intelligence techniques for the automation of some visual assessment processes in agriculture is currently a reality. Image-based, and recently deep learning-based systems are being used in several applications. Main challenge of these applications is to achieve a correct performance in real field conditions over images that are usually acquired with mobile devices and thus offer limited quality. Plagues control is a problem to be tackled in the field. Pest management strategies relies on the identification of the level of infestation. This degree of infestation is established through a counting task manually done by the field researcher so far.Current models were not able to appropriately count due to the small size of the insects and on the last year we presented a density map based algorithm that superseded state of the art methods for a single insect type. In this paper, we extend previous work into a multiclass and multi-stadia approach. Concretely, the proposed algorithm has been tested in two use cases: on the one hand, it counts five different types of adult individuals over multiple crop leaves; and on the other hand, it identifies four different stages for immatures over 2-cm leaf disks. In these leaf disks, some of the species are in different stadia being some of them micron size and difficult to be identified even for the non-expert user.The proposed method achieves good results in both cases. The model for counting adult insects in a leaf achieves a RMSE ranging from 0.89 to 4.47, MAE ranging from 0.40 to 2.15, and R2 ranging from 0.86 to 0.91 for 4 different species in its adult phase (BEMITA, FRANOC, MYZUPE and APHIGO) that may appear together in the same leaf. Besides, for FRANOC, two stadia nymphs and adults are considered. The model developed for counting BEMITA immatures in 2-cm disks obtains R2 values up to 0.98 for big nymphs. This solution was embedded in a docker and can be accessed through an app via REST service in mobile devices. It has been tested in the wild under real conditions in different locations worldwide and over 14 different crops.

Application Marker-Assisted Selection (MAS) and Multiplex PCR Reactions in Resistance Breeding of Maize (Zea mays L.)

Cultivated maize (Zea mays L.) is the oldest and one of the most important crop species in the world. Changing climatic conditions in recent years, warm weather, expansion of acreage and intensification of maize cultivation have resulted in an increase in the threat posed by diseases caused by, among others, Fusarium fungi. Breeding success in all plant species is determined by access to starting materials with possible high genetic diversity also in terms of disease resistance. Identification of parental combinations that produce offspring that are high-yielding and resistant to Fusarium, among other diseases, is one of the costliest steps in breeding programs. We used maize lines which, as a result of five-year field observations, were divided into resistant and susceptible to F. verticillioides. It is known that resistance to fusarium is a trait strongly dependent on environmental conditions. Due to the fact that the years of observation of the degree of infestation were hot and dry, the resistance of some lines could result from favorable environmental conditions. In view of the above, the aim of this study was to analyze the genetic basis of the resistance of these lines and to correlate molecular analyses with field observations. Comprehensive field and molecular analyses will allow the selection of reference lines that will be resistant to fusarium in the field and, at the same time, will have pyramidized resistance genes. Such lines can be used for crossbreeding to obtain fusarium-resistant varieties. In addition, an attempt was made to develop Multiplex PCR conditions for faster identification of the analyzed markers. As a result of the analyses, it was found that the resistance of the studied maize lines was correlated with the number of molecular markers identified in them. Both field and laboratory analyses have shown that the best line that can be used for crossbreeding as a source of fusarium resistance genes is the line number 25. It has a resistance level of 8–9 on the nine-point COBORU scale. In this line, as a result of molecular analyses, 10 out of 12 markers were identified (SSR 85, Bngl 1063, Bngl 1740, Umc 2082, Bngl 1621, Umc 2059, Umc 2013, SSR 93, SSR 105, STS 03) related to fusarium resistance genes, which may be the reason for such a high resistance to this pathogen. Similarly, 9 markers were identified for line number 35 (SSR 85, Bngl 1063, Bngl 1740, Umc 2082, Bngl 1621, Umc 2059, Umc 2013, SSR 93, STS 03). This line, however, was characterized by a slightly lower resistance at the level of 7–8. Line 254 turned out to be the least resistant, as the resistance was at the level of 4–5, and the number of identified molecular markers was 5. Lines numbered 25 and 35 can be successfully used as a source of fusarium resistance genes.

Diversity of amphibian population with reference to various degrees of infestation of Eichhornia crassipes in the ponds of Cauvery delta region, Tamil Nadu, India.

Diversity of amphibian population with reference to various degrees of infestation of Eichhornia crassipes in the ponds of Cauvery delta region, Tamil Nadu, India.

Blood glucose level, blood profile and ectoparasite infestation of cantang grouper fish commercially fed with the addition of marine leeches Zeylanicobdella

The main problem that often occurs in grouper cultivation is the appearance of disease attacks caused by pathogens due to water quality that has not been optimal during maintenance. There are common problems in grouper cultivation, that is unstable environmental conditions that cause accumulation of organic matter which can cause fish to be stress, which is characterized by increased blood glucose levels and susceptible to disease. The types of ectoparasites that commonly attack groupers are Trichodina, Cryptocaryon, Zeylanicobdella and Neobenedenia. An alternative to control pathogen attacks on fish is by increasing the body&#39;s defense cells of fish using immunostimulants. Zeylanicobdella known to have molecular weight of proteins that are immunogenic, and is thought to increase the activity of cells defense of the fish body as an immunostimulant. This study aims to find out the blood glucose level, blood profile and ectoparasite infestation of cantang grouper fish given a marine leeches Zeylanicobdella on feed. The method in this research used an experimental method with a factorial pattern consisting of two factors. Factor P is the dose given and factor Q is the maintenance time. Statistical test results showed there was an influence (p < 0.01) between the doses of marine leeches Zeylanicobdella on the number of erythrocytes and leukocytes, there was also interaction (p > 0.01) between the doses of marine leeches Zeylanicobdella with different maintenance times to the number of erythrocytes, leukocytes, differential leukocytes including lymparhocytes, neutrophils and monocytes. The results showed that there was a very significant difference between blood glucose levels and ectoparasite infestation of cantang grouper maintenance at different doses and times and there was an interaction effect (p < 0.01). The highest blood glucose level of 67.00 ± 5.148 mg/dL occurred in cantang grouper with a moderate degree of ectoparasite infestation of 36.20 ± 2.387 parasites on day 0 of maintenance with a dose of 0 ppm. The lowest blood glucose level of 28.80 ± 0.837 mg/dL occurred in cantang grouper with a mild degree of ectoparasite infestation, that is 12.60 ± 1.517 parasites on the 28th day of rearing with a dose of 9 ppm. The results showed that the highest of total erythrocytes was at a dose of 7 ppm with a maintenance time of the 21th day are 2,534 × 106 cell/ml. Total Leukocyte was at a dose of 9 ppm with a maintenance time of the 28th day are 1,4902 × 106 cell/ml. The percentage of lymphocytes is the highest with a range of 58-93%, neutrophils range from 5-38% and monocytes range from 1-9%.

Analysis of Blood Glucose Levels and The Development of Ectoparasite Infestation on Pacific White Shrimp (Litopenaeus vannamei) Which Were Given Crude Protein Zoothamnium penaei at High Stocking Densities

The main constraint in pacific white shrimp culture with high stocking density (super intensive), can cause a decrease in water quality and shrimp were stress and are susceptible to disease. The purpose of this study was to analyze stress levels (blood glucose levels) and the development of ectoparasite infestations. In this experimental study, used 2 ponds with an area of 2000 m2 per pond, stocking densities in pond I were 150 individuals/m2 and 350 individuals/ m2 in pond II, with a maintenance period of 90 days. The results showed that the shrimp was stressed during rearing, with blood glucose levels of white shrimp at a high stocking density of 350 individuals/ m2 ranging from 43-54 mg/dL significantly different from blood glucose levels at stocking density of 150 individuals/ m2 (p<0.05). The ectoparasites found were the genera Zoothamnium, Epistylis and Vorticella. The development of the infestation of the three genera showed an increase starting on the 30th, 60th and 90th days, the degree of infestation from mild to moderate, but on the 90th day there was a significant difference (p<0.05), with a moderate degree of infestation in the stocking density. 100 individuals/m2 and weight at stocking density 350 individuals/ m2.

The effect of bromelain enzyme on pineapple core on the SR, SGR, and FCR in carp (Cyprinus carpio) infested with Argulus japonicus

Carp (Cyprinus carpio) is a freshwater fish that has several advantages such us fast growth, easy maintenance, good nutritional value and economic value. The demand for carp products is quite high. Based on data from the Directorate General of Aquaculture (2018), there was an increase in production of 33,954 tons from 2010 to 2017. According to Faroq (2020), feeding mixed with pineapple core enzymes can increase the highest daily growth rate and feed efficiency. A more efficient feed is expected for fish to survive more when infected with the Argulus japonicus parasite. The aim of this study was to determine the effect of bromelain enzyme on pineapple core on SR, SGR, and FCR in carp (Cyprinus carpio) infested with Argulus japonicus. This study used a factorial completely randomized design with of 4x2 treatments with bromelain enzyme doses of 0% and 2.25% and the degree of argulus infestation, it is mild, moderate, and severe. The results showed that survival rate (SR), specific growth rate (SGR) and feed conversion (FCR) were not significantly different from use bromelain enzyme in carp infested with Argulus japonicus.

Evaluation of Pigeon Pea (Cajanus cajan L. Millsp) Genotypes to bud Weevil Resistance

An experiment was conducted to evaluate 14new genotypes and released varieties of Pigeon Pea for their resistance or tolerance to bud Weevil Indoza cladustheresiae (Dolla Torre) under natural infestation in pesticide free field about one month prior to observation. In order to assess the degree of infestation 50 buds were randomly picked up from each replication. Bud weevil incidence was recorded with actual larvas inside the buds with the help of magnifying lense and digital USB microscope. On the basis of mean infestation among 14 treatments (4 checks and 10 genotypes) the genotype PT 0911-5-1-1 (5.67 %) and AKTE-1905 (5.67 %) followed by Rajeshwari (10.67 %), BDN 2013-41 (10.67 %) and BDN 2018-2 (10.67 %) were found to be less susceptible whereas genotype BDN-711 (40.67%) and BDN-716 (50.00%) were found to be most susceptible genotypes to bud weevil incidence released varieties

Impact of biologized crop rotations on infestation of crops in arid steppe conditions of Trans-Ural region of Bashkortostan

Relevance. The influence of crop rotations on the infestation of crops has been little studied. А goal was to investigate the influence of biologized crop rotations on infestation of crops in the arid steppe of the Trans-Ural region of Bashkortostan.Methods. The relief of the experimental field is flat, represented by the foothill steppe of the Southern Urals. The soil is black soil, common medium-coal. The climate is arid, with periodically hot summer and moderately cold and little snow winter periods. During the years of experiments (2019–2021), the amount of precipitation for the vegetation period, May — August, averaged 88 mm. Over the past 10–15 years, the aridity and unevenness of the distribution of atmospheric precipitation has noticeably increased, which led to the oppression of field crops and the complication of the fight against weeds.The method of field experimentswas applied. Accounting of infestation was carried by quantitative and weight method. The effect of biologized crop rotations with cereals and alfalfa on the degree ofinfestation of crops compared to traditional grainfallow rotation was evaluated.Results. The infestation of crops in experimental crop rotations depended on the strength of the development of cultivated crops and suppression of weed plants. In the favorable conditions of 2019, weeds developed poorly in well-developed crops, with an amount of 8–10 piece /m2 in biologized crop rotation. In grain-fallow crop rotation, the infestation was 1.2–1.9 times greater. On average over three years at the beginning of the field crop vegetation there are 14–19 piece /m2 weeds in biologized crop rotations, which is 45–56% less than in grain-fallow crop rotation. Before harvesting, the difference in infestation between crop rotations is reduced to 12–29%, but the advantage in reducing infestation in biologized crop rotations remains. In more humidi fied years, fertilizers contribute to a decrease in infestation compared to a back ground without fertilizer. In especially dry years, fertilizers lead to some increase of infestation of crops. Thus, it was found that biologized crop rotations effectively reduce the infestation of crops, regardless of the background of fertilizer.

Population dynamics of synanthropic rodents after a chemical and infrastructural intervention in an urban low-income community

Synanthropic rodents are ubiquitous in low-income communities and pose risks for human health, as they are generally resistant to control programs. However, few or no studies have evaluated the long-term effect of chemical and infrastructural interventions on rodent population dynamics, especially in urban low-income communities, or evaluated the potential recovery of their population following interventions. We conducted a longitudinal study in a low-income community in the city of Salvador (BA, Brazil) to characterize the effect of interventions (chemical and infrastructural) on the dynamics of rodent population, and documented the post-intervention recovery of their population. We evaluated the degree of rodent infestation in 117 households/sampling points over three years (2014–2017), using tracking plates, a proxy for rodent abundance/activity. We reported a significant lower rodent activity/abundance after the chemical and infrastructural interventions (Z = −4.691 (p < 0.001)), with track plate positivity decreasing to 28% from 70% after and before interventions respectively. Therefore, the combination of chemical and infrastructural interventions significantly decreased the degree of rodent infestation in the study area. In addition, no rodent population rebound was recorded until almost a year post-intervention, and the post-intervention infestation level did not attain the pre-intervention level all through the study. Moreover, among pre-treatment conditions, access to sewer rather than the availability of food was the variable most closely associated with household rodent infestation. Our study indicates that Integrated Pest Management (IPM)-approaches are more effective in reducing rodent infestation than the use of a single method. Our findings will be useful in providing guidance for long-term rodent control programs, especially in urban low-income communities.

IMPROVING POTATO PRODUCTION TECHNOLOGY BY OPTIMISING THE USE OF ORGANOMINERAL GROWTH STIMULANTS IN THE FOREST-STEPPE ZONE OF WESTERN SIBERIA

In the article experience of application of various organomineral growth stimulants on potatoes in the conditions of forest-steppe of Western Siberia is stated. In the course of work, the authors used new perspective preparations whose application has an essential influence on growth, development, the structure of a crop, and potato productivity. As a result of work, it has been established, that organomineral growth stimulants slightly influence the duration of the vegetation period of potatoes (1-3 days). The authors found that the infestation and spread of diseases in potato crops depended to a greater extent on the conditions of the year and the preparations used, and to a lesser extent on the variety. On average, the overall degree of plant infestation on the treated background was 2-8 % lower compared to the control. The use of organomineral growth regulators has a positive effect on potato yields. The Epin-Extra preparation was the most effective, application of which provided up to 8.3 t/ha yield increase at tubers treatment, and up to 7.2 t/ha at vegetative plants treatment. The use of organomineral growth regulators does not have a significant impact on quality indicators of potatoes, as the difference between the variants was not more than 1 %.

Studija helminta u ovaca u Laghouat regiji u južnom Alžiru

The objective of this study was to detect helminths in sheep on farms in three different zones of the Laghouat region, and to examine relationships between the prevalence of these parasites and the factors of age, sex, and area. The study was carried out over a period of four months (March to June 2019) on 77 faecal samples taken from 77 sheep. For this purpose, we used both a qualitative technique (flotation) and a quantitative technique (Mac Master). These two techniques allowed us to isolate helminths and determine the degree of infestation of sheep in the steppe region, specifically the Laghouat region. The results showed that the sheep flock studied overall was negative, with the exception of eight subjects infected with Nematodirus or Strongyloides at a rate of 7.49% each. The helminth parasite prevalence was 10.40%. Statistical analysis of the influence of specific factors revealed no significant effect (P˃0.05) for sex, though the effects of age and area were significant (P&amp;lt;0.05). This parasite prevalence must be taken seriously to avoid its detrimental effect on animal health and the zootechnical performance of sheep flocks.

Phytopathogenic micromycetes of oats under the conditions of the Irkutsk region

The results of phytopathological examination of grain batches of oat zoned varieties Rovesnik and Egorych grown in different areas of the Irkutsk region and harvested in 2015-2016 and in 2020-2021 have been presented. Infestation with micromycetes was determined by the wet chamber method according to GOST 12044-93. The weather conditions during the growing years of the examined oat batches were warm and characterized by a deviation of moisture during the growing season from the norm which led to plants weakening and the reinforced development of phytopathogenic micromycetes. A high ubiquitous occurrence of fungi from the genus Alternaria has been established. In 2015 the infestation of oat cultivar with Rovesnik fungi from the genus Alternaria ranged from 20 tо 36 %, and that grown in 2016 – from 44 tо 83 %. The variety Egorych in 2016 was infested from 43 tо 91%. In the batches harvested in 2020 and 2021, irrespective to a cultivar, the infestation was from 70 tо 100 % and from 60 tо 98 %, correspondingly. Bipolaris spp. was observed in all the analyzed batches of oat variety Rovesnik in the harvests of 2015 and 2016 with a varying infestation range of 3-12 % and 4-37 %, respectively. The cultivar Egorych harvested in 2016 had the infestation level from 3 tо 87 %. In the harvests of 2020 and 2021, single batches free from Bipolaris spp. were found, but most of them had a degree of infestation, regardless of a variety, of 7-40 % and 3-45 %, respectively, in 2020 and 2021. The occurrence of phytopathogens of the genus Fusarium spp. did not depend on the variety, but it differed greatly in years. In the grain of most batches harvested in 2015-2016, the infestation with micromycetes Fusarium spp. was within the range of 1-24 %, and in the harvest of 2020-2021 the batches with very high infestation with this pathogen prevailed – 23-93 % and 20-67 %, respectively. Single batches were free of Fusarium spp.