Eficacitatea Trichogramma evanescens westw în câmp în prezenţa substanţelor biologic active cu proprietăţi cairomonale la cultura de floarea soarelui

Abstract

The research conducted during the years 2020-2023 has demonstrated that in the experimental variant (in the presence of biologically active substances), the prolificity of Trichogramma evanescens females increased by approximately 1.4-1.5 times compared to the prolificacy of females in the control variant. As a result, there is a quantitative saving of Sitotroga cerealella eggs in the reproduction process by 20-25%, and of the elite entomophage Trichogramma spp. by about 15-20%. The searching capacity of the entomophage Trichogramma evanescens, as a result of the influence of biologically active substances with kairomonal properties, showed results approximately 1.6 times higher in the control, indicating that females in the control move more slowly than in the experimental variant. In the case of experiments conducted under field conditions, the action of kairomonal substances was confirmed to significantly increase the rate of parasitized eggs compared to the control variant (Td=2.5-4.8 > 1.96=T0.05). Biologically active substances play a crucial role in the biological protection of plants. Testing in the sunflower field showed that the percentage of parasitism varied from. la 57.20- 64.28, control variant the percentage of parazitism varie from 10.45-20.47. (Td=2,5-4,8>1,96=To.o5).