Abstract
Cereal bugs can reduce the yield of cereals, worsen the quality characteristics of grain, and reduce the sowing quality of seeds with intensive reproduction and nutrition. Of all the cereal bugs, Eurygaster integriceps Put is the most damaging. According to scientists, yield loss is typically estimated at 20–30 % in barley and 50–90 % in wheat. In addition to direct crop losses, insects also inject chemicals that dramatically reduce grain quality, with chemical pest control costing over $40 million annually. The aim of the research is to reveal data on the species diversity of cereal bugs in spring barley crops in the conditions of the Uman national university of horticulture and to control their numbers in order to preserve crop yields. Accounting and observations conducted in 2017–2020, in the training and production department of Uman National University of Horticulture. Analysis of the species composition of cereal bugs allowed to clarify the diversity of their species, establish their average number and identify species that are dangerous for cultures during the study period. It was established that five species of cereal bugs which were dangerous to culture were identified from a number of Hemiptera between 2017 and 2020. Four species of cereal bugs were constantly present in the agrocenosis of spring barley – Eurygaster integriceps Put., Aelia acuminata L., Lygus rugulipennis P. and Trigonotylus coelestialium Kirk.. The most dangerous pest for the culture was the species Eurygaster integriceps Put., Which accounted for 36 %, 28 %, 27 % and 24.5 % of the total number of bedbugs, and also exceeded the rate of harmful index. The use of insecticides reduced the number of Eurygaster integriceps Put. for a two-week period after spraying. Average data for 2018–2020 show high technical efficiency at the level of 90.0–92.9 % on the 3rd day after spraying. On the 7th day after the insecticides were applied, the technical efficiency was 85–85.8 %. Application of insecticide Decis Profi 25 WG, v.g. at a rate of 0.04 kg/ha, reduced the number of pests by 82.5 % on the 14th day after spraying.
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