Bokina I.G. 2020. [Lacewing insects (Neuroptera: Chrysopidae, Hemerobiidae) Neuroptera insects (Chrysopidae, Hemerobiidae) according to different spring wheat cultivation practices in the northern forest-steppe of Western Siberia] // Euroasian Entomological Journal. Vol.19. No.2: 67–74 [in Russian, with English summary].
Siberian Federal Scientific Centre of Agro-BioTechnologies of the Russian Academy of Sciences, Novosibirskaya Оblast, Krasnoobsk 630051 Russia. Е-mail: email@example.com
ABSTRACT. Neuroptera (Chrysopidae, Hemerobiidae) is an abundant group of predatory insects involved in the regulation of harmful species in agrocoenosis. Long-term data on no-till technology impact on development of Neuroptera fauna in spring wheat agrocoenoses without spring and autumn soil cultivation are presented. The abundance of neuropterans in the field under no-till technology weakly increased in different years, although average data presented showed no impact on predator number.
The average level of chemical applications during the study period hardly affected the abundance of lacewing imago and larvae. The use of insecticides for plant protection in the spring for wheat fields cultivated under non-till technology considerably reduced the lacewing species number in different years when compared with the reference sample which lacked treatment and containing rich spectrum of predator species. In traditionally cultivated spring wheat fields there was no appreciable decrease in lacewing species number.
Different kinds of spring wheat cultivated by no-till technology did not affect lacewing abundance, but traditionally cultivated Novosibirskaya 44 wheat in some years supported a higher number of lacewings in comparison with Novosibirskaya 31 wheat, but during the study period average data did not differ.
The number of lacewings in the second crop rotation wheat fields traditionally cultivated did not depend on the previously cultivated crop, whereas no-till cultivated fields presented a higher abundance of lacewings in the second crop rotation fields following the cultivation of Brassicaceae plants. Furthermore, a higher level of lacewing abundance was registered in traditionally cultivated fields with Novosibirskaya 44 wheat, while non-till technology fields only provided a higher lacewing abundance in Novosibirskaya 31 following previously cultivated oat.
KEY WORDS: lacewings, brown lacewings, entomophages, cereal aphids, spring wheat, technologies of cultivation, No-Till, variety of wheat, level of chemicalization, predecessors.