scholarly journals Fungicidal activity of new 5-arylazo-7-nitro-8-hydroxyquinolines

2019 ◽  
Vol 60 (11) ◽  
pp. 156-159
Author(s):  
Ilya I. Ustinov ◽  
◽  
Irina V. Shakhkeldyan ◽  
Yury M. Atroshchenko ◽  
Anastasia V. Glazunova ◽  
...  
Keyword(s):  
Causative Agent ◽  
Fungicidal Activity ◽  
Plant Protection ◽  
Apple Scab ◽  
Fungal Growth ◽  
Plant Protection Products ◽  
White Rot ◽  
Published Data ◽  
Urgent Task ◽  
Causative Agents

Currently, agricultural production is impossible without the use of chemical plant protection products, so the search for new effective fungicides is an important and urgent task. A significant part of the systemic fungicides and antimycotics used today are azole derivatives. Research conducted at the Department of Chemistry is devoted to the analysis of the fungicidal and biological activity of substances of various classes of organic compounds, including derivatives of azoles. Previously published data on the fungicidal activity of 2-methyl-5-nitrobenzoxazole and its derivatives showed that 2-methyl-5-nitrobenzoxazole shows the highest fungicidal activity for all types of fungal cultures used in the study. The second nitro group introduced into the 2-methyl-5-nitrobenzoxazole molecule reduces fungitoxicity by 1.5-2 times. Replacing the methyl group with phenyl significantly reduces the fungicidal activity. In continuation of these studies, tests of 5-(4'-chlorophenylazo)-7-nitro-8-hydroxyquinoline, 5-(3',5'-dimethoxyphenylazo)-7-nitro-8-hydroxyquinoline and 5-(3'-methyl-4'-nitrophenylazo)-7-nitro-8-hydroxyqui-noline with respect to V. inaequalis, the causative agent of apple scab, R. solani, the causative agent of rhi-zoctonia, F. oxysporum, F. moniliforme, causative agents of cereal crops, B. sorokiniana – causative agent of root rot and S. sclerotiorum – causative agent of white rot. The radial growth of mycelium was determined according to the method developed by NIITEKHIM, according to which the fungal cultures were sown in nutrient media with the addition of the studied substan-ces. In parallel, a control experiment was conducted in the aquatic environment. The growth of mycelia was controlled by measurements on days 3, 6 and 9. The percentage of inhibition of fungal growth was calculated using the Abbott formula. Analysis of the experimental data demonstrates a higher fungicidal activity of 5-(3',5'-dimethoxy-phenylazo)-7-nitro-8-hydroxyquinoline compared with other azoquinolines for all types of fungal cultures used in the study.

scholarly journals How much pollen do solitary bee larvae consume? Or establishing realistic exposure estimates of solitary bee larvae via pollen for the use in risk assessment

2021 ◽  
Author(s):  
Tobias Pamminger ◽  
Christof Schneider ◽  
Raffael Maas ◽  
Matthias Bergtold
Keyword(s):  
Risk Assessment ◽  
Plant Protection ◽  
Plant Protection Products ◽  
Solitary Bees ◽  
Published Data ◽  
Solitary Bee ◽  
Limited Information ◽  
Data Set ◽  
Scaling Models ◽  
Adult Body Weight

Bees foraging in agricultural habitats can be exposed to plant protection products. In order to limit the risk of adverse events to occur a robust risk assessment is needed, which requires reliable estimates for the expected exposure. Especially the exposure pathways to developing solitary bees are not well described and in the currently proposed form rely on limited information. To address this topic, we used a published data set on the volume of pollen solitary bees provide for their larvae to build two scaling models predicting the amount of protein and pollen developing solitary bees need based on adult body weight. We test our models using both literature and experimental data, which both support the validity of the presented models. Using scaling models in the bee risk assessment could complement existing risk assessment approaches, facilitate the further development of accurate risk characterization for solitary bees and ultimately will help to protect them during their foraging activity in agricultural settings.

scholarly journals WHEAT RUST IDENTIFICATION USING PHYTOPATHOLOGICAL RESEARCH AND MACHINE VISION TECHNOLOGIES

2021 ◽  
Vol 250 ◽  
pp. 109-120
Author(s):  
G.V. Volkova ◽  
◽  
I.V. Arinicheva ◽  
I.V. Arinichev ◽  
I.P. Matveeva ◽  
...  
Keyword(s):  
Neural Networks ◽  
Machine Vision ◽  
Stem Rust ◽  
Plant Protection ◽  
Methodological Approach ◽  
Practical Interest ◽  
Weather Conditions ◽  
Plant Protection Products ◽  
Causative Agents ◽  
Wheat Rust

Wheat is the most economically important and valuable food crop cultivated in most regions of the world, and various diseases have a significant impact on yield parameters. Particular attention in wheat protection technologies from phytopathogens is given to rust, since yield losses, depending on the weather conditions of the season and the resistance of the sown varieties, can range from 30 to 100%. The article provides brief information on wheat rust diseases (yellow, brown, stem rust), as well as on current methods of their identification. Accurate and timely identification of rust pathogens is a key step in making decisions on application of plant protection products in the battle against diseases, which prevents their further development, spread and the occurrence of epiphytoties. The article describes the main method for identification and further record of yellow, brown, stem rust - this is a classic phytopathological study based on usage of human resources. The advantage of this method is its accuracy and versatility. Among the drawbacks, one should single out the labor intensity and the need for a staff of qualified phytopathologists. In view of intensive development of computer technologies and agriculture digitalization, the possibility of using machine vision based on programming of neural networks and their training in identifying the main causative agents of diseases is acquiring scientific and practical interest. A promising methodological approach to identification of phytopathogens when providing phytosanitary monitoring and algorithms used for training of neural networks and applied in machine vision technologies are presented.

scholarly journals Эффективность биостимулятора Реглалг для защиты яблони от парши (Venturia Inaequalis Wint.)

2020 ◽  
Author(s):  
Иван Боубэтрын ◽  
◽  
Алехандру Даскaлюк ◽  
Keyword(s):  
Economic Efficiency ◽  
Negative Impact ◽  
Plant Protection ◽  
Venturia Inaequalis ◽  
Apple Scab ◽  
Plant Protection Products ◽  
Combined Effect ◽  
Apple Orchards ◽  
The Cost

The scope of the research was to determine the efficiency of the combined effect of fungicides and the biostimulator Reglalag in the protection of apple orchards from apple scab disease. The introduction of a biostimulator into the tank mixture with fungicides allowed us to reduce by half the quantity of synthetic plant protection products. This combination allows us to reduce the cost of plant protection, reduces the negative impact of the fungicides on environment, and increases the economic efficiency of apple cultivation.

scholarly journals COMPARATIVE ASSESSMENT OF FUNGICIDAL ACTIVITY OF PREPARATIONS FOR PRESOWING TREATMENT OF WINTER WHEAT

2021 ◽  
Vol 4 (28) ◽  
pp. 149-158
Author(s):  
N.M. Sidorov ◽  
◽  
E.A. Gyrnets ◽  
M.M. Astakhov ◽  
K.Yu. Saenko ◽  
...  
Keyword(s):  
Root Rot ◽  
Seed Treatment ◽  
Fungal Pathogens ◽  
Fungicidal Activity ◽  
Plant Protection ◽  
Aerial Mycelium ◽  
Plant Protection Products ◽  
Inhibitory Effect ◽  
Wide Range

The massive use of one-component fungicides has caused the problem of the emergence of resistant forms of phytopathogens. The development of multicomponent plant protection products is one of the ways of dealing with such a situation. The aim of the study is to determine the effectiveness of multicomponent chemical dressing agents in suppressing the most common fungal pathogens and seed infections in vitro. This work was performed in 2020 in the Federal Research Center for Biological Plant Protection (Krasnodar) in the laboratory of the creation of microbiological plant protection products and a collection of microorganisms. Fungi of the Fusarium, Microdochium, Bipolaris, Alternaria, Penicillium, Rhizoctonia, Septoria, Pyrenophora genera were used as test objects. The fungicidal activity of chemical preparations against economically significant phytopathogens causing root rot was evaluated in laboratory conditions by the method of serial dilutions followed by sowing on a nutrient medium. In addition, the effectiveness of the preparations was investigated by the method of treated seeds phytoexamination according to GOST 12044–93. The preparations, which included triazoles and phenylpyrroles, had the strongest inhibitory effect (100 %) on pathogens of Rhizoctonia, helminthosporiosis and septoria. The preparation containing compounds of the group of triazoles and strobilurins suppressed the growth of Rhizoctonia solani only. The preparations’ inhibitory effect on a number of phytopathogenic fungi was manifested in growth retardation, absence of aerial mycelium development and mycelium pigmentation. Concerning the causative agents of Fusarium root rot, the two-component preparations efficacy ranged from 51 % to 74.4 %; three-component one – from 42.9 % to 84.7 % depending on the species of the genus Fusarium. Presowing seed treatment made it possible to inhibit the growth of fungi of the genera Fusarium, Mucor, Aspergillus; significantly inhibit the development of the fungus Alternaria (spread in the experimental variant – 1.7 %, in the control variant – 46.7 %). From the data obtained, it can be concluded that multicomponent preparations based on triazoles and phenylpyrroles are highly effective in suppressing a wide range of phytopathogens and can be recommended for presowing seed treatment.

scholarly journals A New Active Substance Derived from Lyzed Willaertia magna C2c Maky Cells to Fight Grapevine Downy Mildew

Plants ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1013
Author(s):  
Sandrine Demanèche ◽  
Laurène Mirabel ◽  
Olivier Abbe ◽  
Jean-Baptiste Eberst ◽  
Jean-Luc Souche
Keyword(s):  
Downy Mildew ◽  
Active Substance ◽  
Fungicidal Activity ◽  
Plant Protection ◽  
Chemical Compounds ◽  
Plant Protection Products ◽  
Plasmopara Viticola ◽  
Environmental Toxicity ◽  
Grapevine Downy Mildew ◽  
Chemical Pesticides

Downy mildew of grapevine is one of the most destructive grapevine diseases worldwide. Nowadays, downy mildew control relies almost exclusively on the use of chemical pesticides, including copper products, which are efficient but controversial due to their environmental toxicity. Natural plant protection products have become important solutions in the quest for the sustainable production of food and pest management. However, most biocontrol agents currently on the market, such as biofungicides or elicitors, have a limited efficacy; thus, they cannot replace chemical compounds in full. Our innovation is a natural active substance, which is a lysate of the amoeba Willaertia magna C2c Maky. This active substance is not only able to elicit grapevine defenses, but it also demonstrates direct fungicidal activity against Plasmopara viticola. The efficacy of this new natural substance was demonstrated both in a greenhouse and in a field. The amoeba lysate provided up to 77% protection to grapevine bunches in the field in a natural and safe way.

scholarly journals Antifungal activity of plant essential oils and selected pseudomonas strains against Phomopsis theicola

2017 ◽  
Vol 32 (2) ◽  
pp. 121-127
Author(s):  
Mira Starovic ◽  
Danijela Ristic ◽  
Goran Aleksic ◽  
Snezana Pavlovic ◽  
Mehmet Özcan ◽  
...  
Keyword(s):  
Antifungal Activity ◽  
Essential Oils ◽  
Plant Protection ◽  
Fungal Growth ◽  
Plant Growth Promoting Rhizobacteria ◽  
Plant Protection Products ◽  
Phytopathogenic Fungus ◽  
Plant Essential Oils ◽  
Fungal Growth Inhibition

Development of natural plant protection products as an alternative to synthetic fungicides is of significant importance regarding the environment. This study was carried out with an objective to investigate in vitro antifungal activities of several essential oils extracted from oregano, basil, myrtle and Turkish pickling herb, and the plant growth-promoting rhizobacteria in the genus Pseudomonas, against the phytopathogenic fungus Phomopsis theicola. Microdilution methods were used to determine the minimum inhibitory concentrations (MIC) of selected antimicrobial essential oils (EOs). All EOs exhibited significant levels of antifungal activity against the tested fungal isolates. The oregano EO was found the most potent one (MIC - 5.5 ?g/mL), followed by basil (MIC - 75.0?g/mL), myrtle (MIC - 775 ?g/mL) and Turkish pickling herb (MIC - 7750 ?g/mL). Inhibition of Ph. theicola mycelial growth was observed for all tested Pseudomonas spp. strains. K113 and L1 strains were highly effective and achieved more than 60% of fungal growth inhibition using the overnight culture and more than 57% inhibition by applying cell-free supernatants of both strains. A future field trial with K113 and L1 cultures and cell-free supernatants, containing extracellular metabolites toward Ph. theicola, will estimate their effectiveness and applicability as an alternative to chemical protection of apple trees.

scholarly journals Application of Biopreparations on the Basis of Chitozan in Agriculture

2018 ◽  
pp. 22-28
Author(s):  
Yuliya Zimina ◽  
Galina Sroslova ◽  
Margarita Postnova
Keyword(s):  
Adverse Effect ◽  
Abiotic Stresses ◽  
Natural Compound ◽  
Plant Protection ◽  
Plant Protection Products ◽  
Chemical Fertilizers ◽  
Soil Microbiota ◽  
Physiological Properties ◽  
Urgent Task ◽  
Genetic Level

The widespread use of chemical fertilizers and plant protection products causes a serious imbalance in the environment and has an adverse effect on human health. Therefore, the study of the possibility of using safe bio-fertilizers is a very urgent task. This article provides an overview of research studies on the properties of chitosan that are of interest for use in agriculture. Chitosan, a natural compound that is made from the shells of marine organisms. Currently, a large number of studies are devoted to the study of the properties of chitosan, which protect crops from pathogens, as well as various abiotic stresses. It is established that chitosan effectively improves the physiological properties of plants, and also increases the shelf life of fruits. Chitosan is of interest as an additive to the soil as a nutrient that increases the efficiency of chemical fertilizers and does not affect the beneficial soil microbiota. In addition, chitosan increases the protective functions of plants at the genetic level.

Fungus Spaeropsis Malorum peck. One of the currant stalk drying agents

2020 ◽  
Vol 62 ◽  
pp. 172-178
Author(s):  
S. E. Golovin
Keyword(s):  
Causative Agent ◽  
High Frequency ◽  
Frequency Of Occurrence ◽  
Ribes Nigrum ◽  
Black Currant ◽  
Causative Agents ◽  
Pear Trees ◽  
Red Currant

The article highlights the results of research carried out in 2019-2020 to study the reasons for the drying out of the stems of black currant (Ribes nigrum L.), red currant (Ribes rubrum L.) and golden currant (Ribes aureum L.). As a result of research, the fungus Sphaeropsis malorum Peck. in the first in Russia it was revealed from the drying stems of three types of black currants, red currants and golden currants. This  pathogen inhabited currant stems together with fungi from the genus Cytospora spp., causative agents of stem drying. On red currants, it was established that S. malorum was the main causative agent of branch drying, as indicated by the high frequency of occurrence (75.0-83.3 %) of this fungus on the affected stems, compared with species from the genus Cytospora spp. (16.7-33.3 %) and Phomopsis ribesia (25.0 %). Due to the fact that the cultivation of currants in the immediate vicinity of apple and pear trees leads to infection of plants with the fungus S. malorum, it is necessary to avoid planting currants in the vicinity of fruit-bearing seed gardens.

scholarly journals Effect of the Application Date of Fertilizer Containing Silicon and Potassium on the Yield and Technological Quality of Sugar Beet Roots

Plants ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 370
Author(s):  
Arkadiusz Artyszak ◽  
Dariusz Gozdowski ◽  
Alicja Siuda
Keyword(s):  
Sugar Beet ◽  
Foliar Application ◽  
Plant Protection ◽  
Plant Protection Products ◽  
Water Shortage ◽  
The European Union ◽  
Yield Increase ◽  
Time Of Application ◽  
Technological Quality

Water shortage and drought are a growing problem in Europe. Therefore, effective methods for limiting its effects are necessary. At the same time, the “field to fork” strategy adopted by the European Commission aims to achieve a significant reduction in the use of plant protection products and fertilizers in the European Union. In an experiment conducted in 2018–2020, the effect of the method of foliar fertilization containing silicon and potassium on the yield and technological quality of sugar beet roots was assessed. The fertilizer was used in seven combinations, differing in the number and time of application. The best results were obtained by treating plants during drought stress. The better soil moisture for the plants, the smaller the pure sugar yield increase was observed. It is difficult to clearly state which combination of silicon and potassium foliar application is optimal, as their effects do not differ greatly.

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