Determination of seedling root rot fungal pathogens and disease prevalence rates in cotton fields of the Tigris basin of Diyarbakır province

Cotton is an industrial plant with an important agricultural potential in our country. Like other cultivated plants, it is affected by diseases, and if necessary precautions are not taken on time, it causes low quality and yield, as well as the plant dries up completely and does not produce a product. There are many pathogens that cause root rot of seedlings in the early stages of cotton. İn total, diseased cotton samples were collected from 79 fields. İn this study, surveys were carried out in the most intensive cotton cultivation areas along the Diyarbakır Tigris River, in the years 2021-2022, in the months of May-June. İn the study, Fusarium species (F. oxysporum, F. solani, F.verticiolides F. clamydosporum, F. equiseti, F. Culmorum), R. solani, Macrophomina phaseolina, Macrophomina spp., Alternaria spp., Ulocladium sp., Colletotrichum sp., Thielaviopsis basicola, Mucor sp., Penicillium sp., Curvularia spp., Sclerotinia sp., Trichoderma sp., Gliocladium sp. types have been obtained. Among these species Thielaviopsis bsicola, Alternaria spp., Fusarium moniliforme, Fusarium oxysporum, Fusarium solani were determineted to be highly patogenic. İn addition, the disease rate in the studied fields was found to be between %2-16. The prevalence of the disease in the region was found to be %100.