In the paper are discussed questions of the search entomopathological fungi revealed from amazed worms of a cottonous columbine borer on sowings of a cotton plant and vegetable cultures is discussed. 20 species entomopathological fungi from 12 genuses, 3 families of fungi are as a result evolved. Revealed virulence of mycobiota has been checked.
From the presented data follows that percent of a lesion of worms wax ask in experience at artificial inoculation fluctuates in limens from 2 to 25 %. It is noticed that the destructionof worms in flow of 20 days was marked only in a case with strains of kinds Aspergillus fumigates (4 % - 2 worms were lost), Aspergillus flavus, Trichotecium roseum, Spicaria heliothis and Fusarium lateritium have invoked destruction of 2 %, (1 lost hexapod).
On the basis of the received data the conclusion has been drawn that the revealed kinds to some extent possess defined энтомопатогенными properties, but the yielded strains in a kind of weak virulence for hexapods cannot be applied in the practical purposes.
SUMMARY
In the general agricultural practice of cotton growing, the plants protection from harmful organisms is of particular importance. In the absence of measures against pests, crop losses can be 30% or more.
Cotton and tomatoes are susceptible to colonization of many harmful insects. In Uzbekistan, one of the main pests of cotton and tomatoes is the cotton bollworm. The biology of the cotton bollworm and its moth is currently well studied however, the pathogens of the moth’s disease have not been studied previously.
In the fight against the cotton bollworm of tomatoes that damage the harvest, together with agricultural and chemical measures and methods of biological control are now increasingly have being used. Currently, a significant role in plant protection belongs to the biological method of control, which is a powerful factor in increasing yields and product quality, reducing the use of pesticides and preventing environmental pollution with pesticides. The essence of the biological method consists in the purposeful use of antagonists which have developed in nature between pests of agricultural crops, their parasites and predators, as well as entomopathogens - pathogens of bacterial, fungal and viral pest diseases.
Many researchers have paid attention to the possibility of using entomopathogenic fungi. However, the existing requirements are forcing local specialists and scientists to continue the development, selection and implementation of new highly effective measures that best meet modern environmental requirements.
Entomopathogenic fungi attract the attention of specialists due to their possible use as a means of suppressing the pest population. Theoretically, they can influence pest populations, are able to reduce their numbers, and therefore are promising in biological pest control. In agricultural practice, about 40 drugs are used based on the use of the entomopathogenic properties of microorganisms (Kholmuradov et al., 2011). Due to the high severity of insect pests, great attention is paid to the selection and selection of highly active entomopathogenic microorganisms.
In Uzbekistan, the problem of the possibility of using entomopathogenic microorganisms was dealt with by such scientists as P.N. Golovin, who proposed using fungi to combat the comstock worm, who identified 19 species from 10 genera hyphal fungi and recommended the identified strains of the species Ashersonia placenta B. et Br. to combat greenhouse whitefly. The causative agents of locust diseases were studied by F. Gaffarov and N.Kh. Tufliev (2012). Also, the significance of this group of micromycetes was analyzed by professor A.Sh. Khamraev. Based on the main focus of our work is to study of hyphalic fungi in Uzbekistan, in this publication, we were interested primarily of entomopathogenic hyphalic fungi.