Abstract
The article presents data on the study of the influence of varieties on the dynamics of the number of phytophages in the spring-summer growing season of winter wheat in the conditions of the zone of unstable humidification of the Stavropol Territory. The research was carried out in 2020–2022 on the territory of the educational and experimental farm of the Stavropol State Agrarian University in the crops of Alekseich, Vassa and Tanya varieties. The objects of observations were the red-breasted pyavica (Oulema melanopus L.), the harmful bug turtle (Eurygaster integriceps Put.), large grass aphid (Schizaphis graminum Rond.), common grass aphid (Sitobion avenae F.), w heat t hrips ( Haplothrips tritici Kurd.), common bread sawflies (Cephus pygmaeus L .) a nd b lack ( Trachelus tabidus F.). The Vassa variety contributes to a decrease in the population of the harmful turtle bug by 45.7 % and cereal aphids by 46.4 % in the agrobiocenosis of winter wheat, this is due to two reasons: first, it has a strong wax coating on the ear, which makes it difficult for the imago and phytophagus larvae to feed; second, it is medium-early, so wax ripeness occurs earlier than that of the Alekseich variety, which prevents the normal development of the larvae of the younger pest. The Tanya variety is able to reduce the number of the harmful turtle bug by 12.8 %, due to the fact that it is medium-early and wax ripeness occurs 6–8 days earlier than the Alekseich variety, some of the younger larvae do not have time to eat. Also, this variety has a certain resistance to the red-breasted piavica, since the population of the phytophagus in all the years of observation was 25.0–35.3 % lower than in the crops of the Vassa and Alekseich varieties. Varieties Alekseich, Tanya and Vassa in the zone of unstable humidification of the Stavropol Territory do not have a significant effect on the number of populations of wheat thrips and bread sawflies.
Published Version
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