Effect of crop rotation, pesticides and fertilizers on the abundance and taxonomic composition of spring wheat pests

Abstract

Relevance. One of the main factors in obtaining high yields of high-quality wheat is its protection from pests. Their taxonomic composition and abundance vary depending on the area of research, the phase of vegetation and agricultural technology — variety, predecessor, level of mineral nutrition, use of insecticides, etc. In connection with the above, the purpose of the research was to analyze the response of pests in intensification in the conditions of the steppe zone of the Krasnoyarsk Territory.Methods. The experimental part of the work was carried out in 2017–2022 on the basis of the GSU of the Krasnoturansky district. 13 varieties of soft spring wheat were considered as objects of research. GSU Krasnoturansky district is located in the steppe zone of the Krasnoyarsk Territory. The experiment was laid according to the method of state variety testing. As a fertilizer, based on the results of agrochemical analysis, ammonium nitrate (34.4%) 70 kg a. i. was used. per ha. According to the results of soil analysis, the introduction of phosphorus and potassium was not required. Predecessors of steam and grain. During the growing season, the crops were treated with modern means of protection.Results. It was found that the number of pests on the fallow predecessor was 1.42 times higher than on the grain one. When ammonium nitrate is introduced, the number of insects increases by 1.33 times compared with the unfertilized predecessor. In the steppe zone of the Krasnoyarsk Territory, the most common pests of soft spring wheat are wheat thrips, swedish fly and bread flea.