Data were obtained on the application of the entomopathogenic bacterium Bacillus thuringiensis in synergy with FP-09 for the control of Colorado potato beetle on the potato variety Marabel. The action of entomopathogenic bacteria in combination with FP-09 was determined in the control of Colorado potato beetle larvae stages I and III of the second generation Colorado potato beetle (Leptinotarsa decemlineata) under field conditions on potato crop of the variety «Marabel», where the average biological efficacy of Bacillus thuringiensis 108+ FP-09 was 75.9%. The first and third instar larvae control action was determined with FP-09, where the biological efficacy in controlling larvae of Leptinotarsa decemlineata was on average 37.8%.
