Efficacy of three bioinsecticides for control of Colorado potato beetle on potatoes

Abstract

An experiment was conducted to evaluate the effectiveness of three commercial bioinsecticides based on the spores of Bacillus thuringiensis var. thuringiensis. The control areas were areas where no protective measures were applied. The data showed that all bioinsecticides tested were highly effective against first, second and third instar larvae of the Colorado potato beetle Leptinotarsa decemlineata. The drug “Bitoxibacillin” ensured 100% death of larvae on day 8 at a drug concentration of 10 g/l. Combined preparation “Bitoxibacillin + GUMI” containing spores of Bacillus thuringiensis var. thuringiensis and sodium salts of humic acids, led to 100% death of larvae on the 7th day of observation. As the dosage of the drug was reduced to 5 mg/L, its effectiveness decreased to a 92% mortality rate within 9 days. The complex drug “Bitoxibacillin + Actarofid” contributed to 100% death of Colorado potato beetle larvae of all ages on the 7th day of observation at a concentration of 10 g/l. During the same time interval, 82% and 94% of the larvae died at drug concentrations of 2 mg/l and 5 mg/l, respectively.