Phytonomus (Phytonomus Variabilis Hbst) Infected With the Parasite Batiplektis and Pathogenic Bacteria

Abstract

For the first time in the conditions of the Karshi desert, the bioecology of alfalfa weevil was studied in depth. Important features of insect bioecology were identified, its description and phenological scheme was developed. In the agrocoenosis of alfalfa weevil different microorganisms and epizootic microorganisms cultural-stamps were isolated. The hitherto unknown aspects of the bioecology and activity of the beneficial insect Bathyplectes which naturally reduce the amount of alfalfa weevil, have been identified. Bathyplectes is highly active in drought-tolerant years, infesting alfalfa weevil larvae in large numbers in 3-4-year-olds alfalfa field, while pathogenic microorganisms are more active in relatively moist seasons when alfalfa weevils are abundant. The composition of alfalfa weevil epizootics in the alfalfa agrocenosis of the Karshi desert consists of 21 species of bacteria belonging to 4 families, including 1 species belonging to the family Aerobaster, 13 species belonging to the family Vacillus, 3 species belonging to the family Micrococcus and 4 species belonging to the family Proteus.

Of the 21 species of bacteria identified, 16 have relatively high virulent to alfalfa weevil larvae, including Bacillus subtilus, Bacillus vulgatus Bac. megaterium has the most active pathogenicity potential.