Changing insecticidal activity of entomopathogenic strains of Bacillus thuringiensis during long-term storage

The preparations based on Bacillus thuringiensis are widely used throughout the world due to their pathogenic properties to various insects. Maintaining strains in active state and preserving their target properties is an integral part of the work in the creation and production of biological drugs. At periodic resowings of entomopatogenny strains of Bacillus thuringiensis there is a probability that microorganisms will lose the pathogenicity concerning the pest. The purpose of the study is to conduct a comparative assessment of insecticidal activity of some entomopathogenic strains of Bacillus thuringiensis, which are available in the museum collection of the Microbiology, Virology and Immunology Department of the Far East Zone Research Veterinary Institute in relation to the larvae of a large wax moth. Comparative characteristic of insecticidal activity of different strains of Bacillus thuringiensis, high-pathogenic against larvae of a big wax moth is submitted. The cultures were preserved for nine years in the museum collection of the institute of Insecticidal Activity of the Cultures, were defined under laboratory conditions in accordance with methodological recommendations “Isolation and selection of highly virulent cultures ofBacillus thuringiensis var...