Pioneer: Journal of Advanced Research and Scientific Progress (JARSP) Volume: 02 Issue: 03 | 2023 ISSN: 2751-7551 http://innosci.org 90 | Page Analysis of the Nematode Fauna of Watermelon Households of Akdarya District of Samarkand Region Boltaev Komil Sultonovich Candidate of Biological Sciences, SamSMU, Samarkand, Uzbekistan Jamalova Feruza Abdusalamovna Trainee assistant, SamSMU, Samarkand, Uzbekistan Vakhidova Adolat Mamatkulovna Doctor of Biological Sciences, Associate Professor of SamSMU, Samarkand, Uzbekistan Muradova Emma Vladimirovna Assistant, SamSMU, Samarkand, Uzbekistan Abstract: In recent years, there has been an increase in the number of diseases caused by phytopathogens. These pathogens affect plants at different stages of their growth and agricultural production. Depending on weather conditions and the phytosanitary condition of crops, the prevalence of diseases can reach 70-80% of the entire plant population, and yields can decrease in some cases by 80-98% [1]. Plants have intracellular immunity, but specific phytopathogens are abletoovercomeit. The article presents a brief description of nematode species, theirimpacton the reduction of yieldand quality of watermelon varieties "Marmar" (Marble). A comparative study of nematode of the settlements "Juraboy Darkhan" and "Ozod Darkhon" of the Akdarya district of the Samarkand region was carried out. Keywords: nematodofauna, phytonematodes, watermelon, basalsoil, phytohelminth, rhizosphere, nematosis. Relevance. Phytonematodes, obligate endoparasites of the root system that cause plant diseases, are an important factor that reduces the yield of most agricultural field and greenhouse vegetable crops [2,3]. Phytonematodes cause great harm to agriculture both directly and stimulate the development of a number of fungal, bacterial and viral diseases of melon crops [1,4]. In this regard, the task of preventing losses of agricultural products from pests of cultivated plants arises. Materials and methods. This work was carried out during 2022 in the farms of the village "JurabaiDarkhon" and "OzodDarkhon" of the Akdarya district of the Samarkand region. The territory of the surveyed farms is located in the floodplain of the Akdarya River. The lands of the farms lie near the tugai zone. The climate is characterized by relatively high humidity. There are sharp fluctuations in temperature during the day and year. Precipitationistimedtotheautumn- winterperiod. The collection of material on the fauna of watermelon nematodes was carried out during the period of removable ripeness, and in August, September 2022. In the course of work on the territory of each farm, 10 plants with basal soil at a depth of 0-15 cm were extracted from vegetable crop plots. The study of the species composition of the nematodofauna was carried out on the basis of the analysis of own and literary data obtained during phytohelminthological studies of the rhizosphere of watermelon. When collecting and processing phytohelminthological