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Biological method of crop protection in the fergana valley

Abstract

A biological method of crop protection, which is based on the efficiency of artificial inoculation with bioagents (Trichogramma, Braconidae, Chrysopidae, etc.) and natural self-regulation of arthropods, is one of the elements of the integrated crop protection system. In Andijan region, after a long period unfavorable for the development of cotton bollworms (Helicoverpa armigera Hb.), the outbreak of this pest occurred in 2015 and 2017. In 2015, a series of tests was performed at the farms of Izboskan district in order to study the efficiency of Trichogramma (Trichogramma pintoi) and Braconidae (Bracon hebetor) reared at the local laboratory of Andijan Institute of Agriculture. The optimal timing of Trichogramma release was determined according to the signals in pheromone traps provided by the Institute of Bioorganic Chemistry of the Academy of Sciences of the Republic of Uzbekistan. The bioagents received from the laboratory showed poor performance. With the natural 38-50% fertility (sterility) of eggs and natural 3.1-4.8% infestation of eggs with Trichogramma (control I), the local parasite population showed 5.3-25.5% efficiency, the population reared at the laboratory showed 28.4-48.7% efficiency. Thus, the biological method aimed against cotton bollworms was justified in areas with the moderate size of pests (up to 20-25 eggs and caterpillars per 100 plants). In case of outbreaks, it is reasonable to use insecticidal protection. Of particular interest in the biological method of plant protection is Chrysopidae. Taking into account the results of many experiments on the efficiency of Chrysopidae after its larvae release in the ratio of 1:10-15, it can be stated that the release of one Chrysopidae is not effective.

About the Author

M. N. Yusupova
Andijan Institute of Agriculture
Russian Federation


References

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For citations:


Yusupova M.N. Biological method of crop protection in the fergana valley. Agrarian science. 2018;(6):68-70. (In Russ.)

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ISSN 0869-8155 (Print)
ISSN 2686-701X (Online)
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