Published in Scientific Papers. Series A. Agronomy, Vol. LXV, Issue 2
Written by Atanas IVANOV, Adelina HARIZANOVA
The pollen beetle Brassicogethes aeneus F. (Coleoptera: Nitidulidae) is a major pest of оilseed rape and shows increasing resistance to commonly used insecticides. The aim of the study was to determine the effective dose of potassium salts of carboxyl fatty acids against the pest and to compare their efficacy with two pyrethroid products commonly used in conventional agriculture. The experiment was conducted on the field in the region of Plovdiv, Bulgaria in 2021. Two applications were made in an interval of 7 days between them. The treatment list contained untreated control, potassium salts of carboxyl fatty acids (in two doses: 2.5 l/ha and 5 l/ha), deltamethrin 0.05 l/ha, and tau-fluvalinate 0.2 l/ha. The results obtained show that the application of potassium salts of carboxyl fatty acids in the dose of 5 l/ha significantly reduces the number of the pollen beetle Brassicogethes aeneus F. and even slightly increases the oilseed rape yield. This substance could be successfully used as a plant protection product against the pollen beetle on oilseed rape as an alternative to the applied pyrethroid products.
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