FIELD: agriculture, insecticides. SUBSTANCE: invention relates to the field of plants protection. Agent consists of a mixture of an aqueous suspension of the preparation "Nemabakt" based on entomopathogenic nematodes of species Steinernema carpocapsae, strain agriotos in the concentration 2000-5000 invasion larvae/ml and an aqueous suspension of nematodes of species Steinernema feltiae, strain 18 in the concentration 2000-4000 invasion larvae/ml. Potato plants are sprayed with this agent in period of total breeding Colorado potato beetle larvae of the 1st instar stage. Invention provides increase of biological effectiveness of control up to 72.1-75.8% that 10.9-24.6% above of that of separately taken nematode aqueous suspensions. Invention can be used as an agent for control of Colorado potato beetle larvae in potato plantings. EFFECT: enhanced effectiveness of agent. 1 tbl, 5 ex
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