Resistance of New Hybrids of Cotton to Some Biotic Factors and the Results of Sorting Experiments

Cotton Breeding, Seed Production, and Agrotechnologies Research Institute, Tashkent, Uzbekistan

^* Corresponding author: elnoraxon86@mail.ru

Abstract

Based on the results of long-term experiments of the authors of the article, the tolerance of ridges formed as a result of simple and complex hybridization to fork diseases in an artificially infected environment with the bacterium Xanthomonas malvacearum, to homosis in a naturally infected environment with the fungus Verticillium dahliae Cleb was analyzed. It was found that Gommosis affects 12.5 percent, up to 21.9 percent, with a spring form, and 9.1 percent, up to 16.4 percent with an autumn form. It was noted that complex cotton hybrids with medium fiber F8 were infected with the spring form of gommosis from 7.9 percent to 14.7 percent and the autumn form from 18.7 percent. The S-6524 variety, taken as a template, was affected by the spring form of gommosa disease 15.2 percent and the autumn form 13.4 percent. The new ridge created as a result of research is 2.7 centners higher for the first crop than the template variety, 0.6 centners less for the second, and 2.1 centners higher for the total yield. During the growing season, the shoots open 3 days earlier than in the template variety. In terms of defects, the new T-300 comb weighed 5.8 grams, while the C-6524 sample weighed 5.3 grams.At the same time, it was found that the weight of the pieces exceeds 0.5 grams, and the fiber yield indicators exceed the reference ones by 5.6 percent. The fiber yield was 14.5 c/ha on the new T-300 ridge, which is 0.3 c/ha higher than that of the template variety. Thus, the new T-300 ridge, resistant to some biotic factors, surpassed the template variety in most features, demonstrating.