Distribution of coccinellidae in agrocenoses of Kashkadarya

¹ Karshi State University, Karshi, 180100, Uzbekistan
² Alfraganus University, Tashkent, 100000, Uzbekistan
³ Tashkent State Agrarian University, Tashkent, 100140, Uzbekistan

^* Corresponding author: xurshida362@gmail.com

Abstract

This article is devoted to the study of the level of distribution of coccinellids in agrocoenoses, in which the static distribution of coccinellids in agricultural crop fields: corn fields, winter wheat fields, cotton crops, sugarcane crops, pea crops and alfalfa fields is analyzed. As a result of the research, the effect of corn planting periods on the number of coccinellids, the dynamics of reproduction of pests and coccinellids depending on the varieties of winter wheat were also studied. The sowing time of corn plant is also found to affect the number of coconans, while in the early stages of the crop, one plant contains up to 89 coccinellids during the flowering of corn. Coccinellids were found in large numbers in cultivated fields, and the following 18 types of coccinellids were identified. Correlative analysis of changes in predator:prey ratio in the process of study of reproduction dynamics of coccinellids and aphids depending on the periods of growth and development of maize planted in May: earing, fertilization, flowering, milk-wax ripening. According to the results, the ratio of coccinellid: aphid during the tuber period of corn was on average 4.96:11.68, and the correlation index was found to be very low (0.15446). According to the results of the analysis, there is a weak correlation between coccinellid: aphids during the fruiting period of the corn plant, and their correlation was shown in the correlation indicators during the flowering period. 6 species of predatory coccinellids were recorded during the research conducted in winter wheat fields. 10 types of coccinellids were recorded in cotton and cotton fields, 15 types of coccinellids in alfalfa fields, and 5 types of predatory coccinellids in pea fields. According to the obtained results, the highest number of coccinellids was recorded in the fields planted with corn.