The condition and dynamics of the entomophilic fauna of Medicago sativa L. seeds in the cultivated lands of the Belgorod region were studied, using insecticides and without treatment. The species composition of pests, entomophages and pollinators on seed crops M. sativa is found. 17% of pollinator species have been found to belong to the family Megachilidae. The species density of the entomofauna of potential pollinators after treatment with insecticide decreased by a factor of 2. The Menhinick index is also down on 50%, indicating a decrease in species diversity. It has been proved that with the correct dosage of insecticide, as well as under the conditions of treatment (from 22-00 to 05-00 – during the absence of flying’s of pollinator insects), part of the entomofauna of pollinators remains, while most of the pests die.


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