Biological effectiveness of biorational insecticides in combination with the entomophagous Habrobracon hebetor (Say, 1836) against the Asian corn borer Ostrinia furnacalis (Guenee, 1854)

Abstract

The paper presents the results of a field study on the effectiveness of the entomophagous insect Habrobracon hebetor (Say, 1836) and bio-rational insecticides BioKill, EC (10 g/l) and Proclaim, WSG (50 g/kg). The experiments were conducted in the Primorsky Territory in 2022-2023. The Asian corn borer was the research object. The design of the experiment included seven variants: the control (without any treatment and the use of the entomophagous insect) and treatments with insecticides and single and double release of the parasitoids. The experiment was carried out with three repetitions. The area of the experimental field plot was 28 m². The effectiveness was determined depending on the degree of the damage caused to plants (point score) according to the methodology of I.D. Shapiro. The research goal was to study the biological efficacy of Habrobracon hebetor (Say, 1836) in combination with the insecticides against the Asian corn borer. During the research, a high percentage of damage to the cob and cob stalk, as well as breakage of the stem and tassel by the corn borer, was identified in the control variant – 10 and 15%, 36.7 and 16.8%, respectively. The lowest degree of damage was cha racteristic of the variants with the use of Proclaim, WSG + the double release of the entomophagous insect – 0.2 points and with the use of Biokill, EC + the single release of the parasitoid – 0.3 points. The use of bio-insecticide Proclaim, WSG, in combination with the double release of Habrobracon hebetor (Say, 1836) showed high biological efficacy. The highest gain in grain yield per ear (21 g) in comparison to the control was found in the variant with the use of Proclaim, WSG (0.2 kg/ha), and the double release of the entomophagous insect.