RICE DISEASES CAUSED BY PARASITIC NEMATODES AND PREVENTIVE MEASURES

Abstract

A prevalence of parasitic species of nematodes in the rice fields of Surkhandarya region, along with phytohelminths which we focused on, the nematodes with the other economic groups were defined. The species, such as Longidorus elongatus, Aphelenchoides besseyi, A. parietinus, A.fragaria, Ditylenchus dipsaci, Nothotylenchus acris, and Tylenchorhynchus cylindricus, T.annulatus, T.martini, Merlinius brevidens, Helicotylenchus erythrinae, Pratylenchus pratensis, P. brachurus, Hirschmanniella gracilis and H.oryzae were found during the research. All these found species were identified mainly in the basal soil and root system of rice. In small numbers, species such as Longidorus elongatus (27 individuals), Aphelenchoides besseyi (1346 individuals), Tylenchorhynchus cylindricus (320 individuals), T.annulatus (248 individuals), T.martini (38 individuals), Merlinius brevidens (350 individuals) and Pratylenchus pratensis (487 individuals) were identified. Six species (Tobrilis stefanski, Tobrilis medius, Macrolaimus Taurus, Nygolaimus hartingi, Eudorylaimus iners, and Hirschmanniela gracilis) of nematodes are new to the fauna of Uzbekistan. In Uzbekistan, these nematodes were often registered on cotton, strawberries, carrots, peas, alfalfa, tomatoes, wheat, corn, sugarcane, peanuts, pomegranates, persimmons, figs, pistachios, noble laurels, unabi and in a number of weeds in all regions of the Republic. Pratylenchus pratensis was found by us in the amount of 487 copies in the rhizosphere, roots and stalks of rice in the Shurchi, Muzrabad and Kumkurgan districts of Surkhandarya region. Six species (Tobrilis stefanski, Tobrilis medius, Macrolaimus Taurus, Nygolaimus hartingi, Eudorylaimus iners, and Hirschmanniella gracilis) of nematodes are new to the fauna of Uzbekistan.