Abstract
This article presents the results of our experiments in the farm “Shonli Dior Fayz” in the Buka district of Tashkent region, the results of studies on the occurrence, spread of white rot disease in sunflower, symptoms of the fungus pathogen, the harm of the disease and the biological effectiveness of the applied fungicides.
 Due to the fact that none of the fungicides allowed for testing in the Republic of Uzbekistan was recommended for use against sunflower white rot disease, the recommended norms for other crops for diseases with white rot were tested.
 Based on the biology of pathogens, fungicides were used as control measures: Fundazol 50% sp. - 2.0 kg / ha. and Difen super 55% sp - 0.25 kg / ha. and their biological efficiencies are determined
Highlights
According to R.O Ochilov (2008) and others, white rot of sunflower in Uzbekistan occurs during the growing season, mainly during the ripening period of sunflower, causing great damage to baskets
OF RESEARCH In our experiments, we investigated the effect of certain fungicides that are allowed to be used against white rot in the Republic of Uzbekistan
During our many years of research, it became clear that the disease of white rot in sunflowers in Uzbekistan is often observed during the ripening of baskets
Summary
According to R.O Ochilov (2008) and others, white rot of sunflower in Uzbekistan occurs during the growing season, mainly during the ripening period of sunflower, causing great damage to baskets. The pathogen has several forms of manifestation, depending on the period of infection of various organs and the nature of the damage to the host plant by the parasite: root, root, stem and basket [1;2; 3]. From the time the grasses appear on young plants until the formation of six pairs of leaves, the disease usually appears in the form of seeds, stem base and white felt-like dust on the leaves. The dusty part of the plant stem turns brownish-brown, its bark tissue is eroded, the conductive ligaments are stripped in the form of thin cords. The spots grow very quickly and occupy a large part of the basket On their surface a white felt-like dust is formed, which penetrates to the seed [2; 4; 6; 8; 10]
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