Studying the powdery mildews disease effect on the vegetative stage of Triticum aestivum genotypes

The article studied the effect of powdery mildews on the vegetative stage using the Morocco variety, introduced from international breeding centers in 2016-2018, and local varieties Nurlu 99, Mirbashir 128 and Murov. The research work was carried out in two versions (experimental (infected) and control (healthy)) in 4 repetitions. It was established that the varieties in question were infected with powdery mildews in different phases of development (the Morocco variety introduced from abroad at the beginning of the tillering phase, the local variety Nurlu 99 at the end of the booting phase, the Mirbashir 128 variety at the end of the tillering phase and the Murov variety at the beginning of the booting phase). These varieties were infected at different levels at different developmental stages, so powdery mildews affected the developmental phases differently. As a result of the research, it was established that powdery mildews in the experimental (infected) version influenced the duration of the vegetative stage, contributed to its reduction, and in the period from the heading phase to full ripeness of the grain, it accelerated ripening, which ultimately caused a decrease in the structural components and yield of the product. The effect of powdery mildews on the vegetative stage largely depends on the biological characteristics of the varieties, the level of infection, the developmental phases during which the infection occurred and the duration of the disease.