An eco-friendly way to protect wheat seeds from phytopathogens

Protecting wheat seed from phytopathogens is a popular topic for plant breeders. The objects requiring close attention and control on wheat are smut infections, pathogens of root rot. And if the pathogens of smut we have learned to fight quite effectively with, then microorganisms that infect underground parts of plants are controlled with less success and many questions in the system of protection against them remain controversial. The issue of reducing the pesticide load on agrocenoses, starting with the protection of seeds, also remains relevant. The article presents the results of field trials of means of protecting spring wheat seeds from root rot in 2019–2020, carried out within the framework of the state assignment at the Kurgan SRIA — branch of FSBSI UrFASRC, according to generally accepted methods. The aim of the research was to assess the biological, economic efficiency of the combined use of a chemical seed dressing agent and a biofungicide based on Bacillus subtilis in protecting wheat from soil-seed infections, to determine the competitiveness of an ecologized method of protecting seeds (reduced consumption rate of a chemical seed dressing agent in combination with biological fungicide). The obtained research results indicate that with a high level of damage to wheat by root rot (Fusarium, B. sorokiniana), the use of seed treatment with the studied preparations ensured the preservation of 10–12% of the yield, more efficiency was noted in the variants with the Oplot 0.5 l/t and the Oplot 0.3 l/t + Nodix Premium 0.3 l/t . The technical effectiveness of fungicides against wheat root rot ranged 44% for Nodix Premium to 85–86% for chemical protection and mixed use. An environmentally friendly method of protecting wheat seeds, which consists in using a 40% lower rate of a chemical dressing agent with a biopesticide, turned out to be competitive.

Determinan Produksi Padi Pada Kelompok Tani Rukun Tani di Desa Ciampea Udik Kecamatan Ciampea Kabupaten Bogor

Abstrak Penelitian ini memiliki maksud mengetahui faktor-faktor yang mempengaruhi produksi padi di Kelompok Tani Rukun Tani, Desa Ciampea Udik, Kecamatan Ciampea, Kabupaten Bogor. Jenis penelitian adalah deskriptif kuantitatif. Analisis data memakai uji hipotesis dan uji asumsi klasik, teknik pengolahan data menggunakan alat SPSS versi 20 yang menghasilkan regresi linier berganda. Hasil analisis determinan secara segmental, komponen produksi, luas lahan, biaya pupuk, biaya pestisida, dan varietas padi berdampak secara signifikan terhadap produksi padi. Peubah yang tidak berdampak secara parsial terhadap produksi padi yaitu faktor produksi tenaga kerja. Secara simultan faktor produksi luas lahan, beban pupuk, beban pestisida, tenaga kerja, dan varietas padi memberikan dampak secara signifikan terhadap produksi padi Kelompok Tani Rukun Tani di Desa Ciampea Udik. Produksi padi pada Kelompok Tani Rukun Tani di Desa Ciampea Udik sebesar 85,4% ditentukan oleh luas lahan, beban pupuk, beban pestisida, tenaga kerja dan varietas padi.AbstractThis study aims to determine the factors that influence rice production in the Rukun Tani Farmer Group, Ciampea Udik Village, Ciampea District, Bogor Regency. This type of research is descriptive quantitative. Data analysis using hypothesis testing and classical assumption test, data processing technique using SPSS version 20 which produces multiple linear regression. The results of segmental determinant analysis, production components, land area, fertilizer costs, pesticide costs, and rice varieties have a significant impact on rice production. The variable that does not have a partial impact on rice production is the labor production factor. Simultaneously the production factors of land area, fertilizer load, pesticide burden, labor, and rice varieties have a significant impact on the rice production of the Rukun Tani Farmer Group in Ciampea Udik Village. Rice production in the Rukun Tani Farmer Group in Ciampea Udik Village was 85.4% determined by land area, fertilizer load, pesticide load, labor, and rice varieties.

Simulated Herbicide Spray Retention on Floating Aquatic Plants as Affected by Carrier Volume and Adjuvant Type

Foliar delivery of herbicides is a common means for plant management in aquatic environments. Though this technique is decades old, little is known about vegetative spray retention relative to this application method. A more complete understanding of maximizing herbicide retention could lead to improved plant management while simultaneously decreasing pesticide load in aquatic environments. Therefore, outdoor mesocosm experiments were conducted in 2020 to evaluate the effect of adjuvant type on foliar spray retention in waterhyacinth. Additionally, the effect of carrier volume on spray retention in waterhyacinth, waterlettuce, and giant salvinia was documented. Spray deposition did not differ among the nine adjuvants tested; however, spray retention was reduced 6 to 11% when an adjuvant was excluded from the spray solution. The effect of carrier volume on spray retention in waterhyacinth, waterlettuce, and giant salvinia was also investigated. Decreases in spray retention was most sensitive to increased carrier volume in waterhyacinth, followed by giant salvinia and waterlettuce. Among species, spray retention potential, as determined by intercept estimates, was greatest in waterlettuce and giant salvinia regardless of carrier volume. Asymptotes estimates for waterhyacinth, waterlettuce, and giant salvinia were 33, 46, and 79% spray retention, respectively. In other words, spray retention was the lowest and remained relatively constant at these values for the high carrier volumes tested (935 and 1870 L ha−1), which were likely due to the presence of pubescence on leaves and flatter leaf architecture represented by waterlettuce and giant salvinia compared to the glabrous vertical leaves of waterhyacinth. Future research will evaluate these concepts under field conditions.

THE EFFECTIVENESS OF BIOLOGICAL FUNGICIDES AGAINST THE SPARE PARTS OF THE LEAVES OF WINTER WHEAT IN THE CONDITIONS OF THE CENTRAL ZONE OF THE KRASNODAR TERRITORY

The biologization of plant growing in modern conditions is becoming an urgent trend in agriculture, which helps to reduce the pesticide load. An important aspect of the transition to organic farming is the use of fungicides based on living microorganisms and their metabolic products to curb the development of diseases. Studies were carried out to assess the effectiveness of modern biofungicides against leaf septoria (Septoria tritici) and yellow spot (Pyrenophora tritici-repentis) of winter wheat - Vitaplan, SP, Gamair, SP, Pseudobacterin-2, Zh, Rizoplan, Zh, Trichocin, SP, Fitosporin -M, SP. Fungicide Amistar Extra, SK was used as a chemical standard. The work was carried out in the conditions of the central zone of the Krasnodar Territory in 2019–2020 on the variety Grom, susceptible to leaf spots. The meteorological conditions of the first year of research were favorable for the development of pathogens of leaf spots. In the second year, conditions were extreme, both for the growth of wheat plants and for the development of phytopathogens. For two years of research, the most effective biofungicides against leaf septoria were Fitosporin-M, SP, Pseudobacterin-2, Zh and Vitaplan, SP, the biological effectiveness was 50.0%, 50.0% and 47.1%, respectively; against yellow spot - Vitaplan, SP and Trichocin, SP, biological efficiency was 48.4% and 45.9%. The use of biological fungicides made it possible to save from 2.5% (Gamair, SP) to 12.6% (Trichocin, SP) of the winter wheat grain yield in comparison with the control (without treatment). The high economic efficiency of the use of biofungicides was established, the maximum net profit was noted in the variant treated with Fitosporin - M, SP (9540 rubles / ha)

Principles of construction of integrated pest protection systems of fruit crops

The main features are identified and a model of the formation of the patho-entomoacarocomplex of fruit plantations is developed. The species composition of the orchard agrocenosis is formed mainly over a 5-7-year period and reaches a peak by the age of 14. It is established that the specific biodiversity of pathogens and phytophages in orchards is primarily due to the presence of a food base that ensures their vital activity. The population density of harmful species depends on the age of the orchard, agricultural techniques of cultivation, insecticides used and meteorological conditions of the growing season. In dry years, there is an increase in the number of representatives of the order Acariformes, and in moderately wet years - representatives of Aphidinea. With an increase in the population density of phytophages, there are entomoacariphages trophically associated with them, the species and quantitative composition of which depends on the presence of pests in the orchard and is controlled by the use of pesticides. The use of pesticides has a detrimental effect on the number of entomoacariphages, which destabilizes the phytosanitary state of the agroecosystem, reduces its stability and balance, so biotic factors - predators, parasites and entomopathogenic organisms - in industrial orchards with a high pesticide load do not play a significant role in limiting the number of phytophages. Systems for the protection of fruit stands should be based on systematic monitoring of the phytosanitary status of a particular agrocenosis, taking into account the determination of the number of dominant species, their environmental requirements, as well as the peculiarities of biology, phenology and population dynamics. When drawing up a plan of protective measures for a particular orchard, its age and cultivation system should be taken into account. When choosing a preparation, preference should be given to low-toxic pesticides with low consumption rates or biological preparations, which will help to stabilize the phytosanitary state of the agrocenosis.

An improved method for the parameterization of sediment trapping in VFSMOD

<p>The most widely implemented mitigation measure to reduce transfer of pesticides to surface water bodies via surface runoff are vegetative filter strips (VFS). To reliably model the reduction of surface runoff, eroded sediment and pesticide load by VFS an event-based model is needed. The most commonly used model for this purpose is VFSMOD. VFSMOD simulates reduction of total inflow (∆Q) and reduction of incoming eroded sediment load (∆E) mechanistically. These variables are subsequently used to calculate the reduction of pesticide load (∆P). While ∆P can be relatively well predicted from ∆Q, ∆E and some other variables, errors in ∆Q and ∆E will propagate to ∆P. Hence, for strongly sorbing compounds, an accurate prediction of ∆E is crucial. The most important parameter characterizing the incoming sediment in VFSMOD is the median particle diameter d50. The objective of this study was to derive a generic d50 parameterization methodology for sediment trapping in VFSMOD that can be readily used for regulatory VFS scenarios.</p><p>Four studies with 16 hydrological events were selected for modelling. A first set of VFSMOD simulations, following the SWAN-VFSMOD sediment parameterization with d50 = 20 µm yielded a general overestimation of ∆E. Consequently, a maximum-likelihood-based calibration and uncertainty analysis with the DREAM-ZS algorithm was performed for the 16 events. The resulting d50 values were all in the low range (1.3-5.4 µm) and did not allow to establish a robust relationship to predict a wider range of d50 from the available explanatory variables. To increase the sample size and the range of d50 values, the comprehensive Kinston dataset for a loamy sand in North Carolina was calibrated with DREAM-ZS. Calibration was performed separately for each hydrological event. Further data points with measured particle size distributions in run-on were assimilated from the literature. The extended test data set of d50 values and explanatory variables was analysed using an extended multiple linear regression (MLR) approach and Classification and Regression Trees (CART).</p><p>A good calibration of event totals and outflow hydrographs could be achieved for most events and VFS treatments of the Kinston site. The calibrated d50 values yielded a wider range (2-16 µm) than the initial 16 events.</p><p>The improved d50 parameterization method derived with MLR/CART will be adopted in the next version of SWAN-VFSMOD to provide more realistic quantitative mitigation within FOCUS STEP4.</p>

An Integrated Vegetated Treatment System for Mitigating Imidacloprid and Permethrin in Agricultural Irrigation Runoff

Pyrethroid and neonicotinoid pesticides control an array of insect pests in leafy greens, but there are concerns about the off-site movement and potential water quality impacts of these chemicals. Effective on-farm management practices can eliminate aquatic toxicity and pesticides in runoff. This project evaluated an integrated vegetated treatment system (VTS), including the use of polyacrylamide (PAM), for minimizing the toxicity of imidacloprid and permethrin pesticides in runoff. The VTS incorporated a sediment trap to remove coarse particles, a grass-lined ditch with compost swales to remove suspended sediment and insecticides, and granulated activated carbon (GAC) or biochar to remove residual insecticides. Runoff was sampled throughout the VTS and analyzed for pesticide concentrations, and aquatic toxicity using the midge Chironomusdilutus and the amphipod Hyalella azteca. In simulated runoff experiments, the VTS reduced suspended sediment load by 88%, and imidacloprid and permethrin load by 97% and 99%, respectively. In runoff events from a conventionally grown lettuce field, suspended sediment load was reduced by 98%, and insecticide load by 99%. Toxicity was significantly reduced in approximately half of the simulated runoff events, and most of the lettuce runoff events. Integrated vegetated treatment systems that include components for treating soluble and hydrophobic pesticides are vital tools for reducing pesticide load and occurrence of pesticide-related toxicity.