On occurrence of nematodes in the upper ganges canal in Uttar Pradesh Waliullah M. I. S. Department of Zoology, Aligarh Muslim University, Aligarh-1. Presented at Nematology Symposium held at Coimbatore, India in February, 1981 Abstract In order to investigate the occurrence of nematodes in the irrigation water in Uttar Pradesh, India, a survey of the Upper Ganges canal was conducted from October 1978 to December 1979. The irrigation water was found to contain from 1 to 5 nematodes per litre of water. Nematodes found in the canal included, among others, representatives of orders Tylenchida and Dorylaimida. The tylenchid nematodes were about 12–35% of the total population. Species of the tylenchid genera, Tylenchus Bastian, 1865; Tylenchorhynchus Cobb, 1913; Helicotylenchus Steiner, 1945; Rotylenchus Filipjev, 1936; Basiria Siddiqi, 1959; Basirolaimus Shamsi, 1979; Aphelenchus Bastian, 1865; Sakia Khan, 1964; Hemicriconemodies Chitwood & Birchfield, 1957; Quinisulcius Siddiqi, 1971; were observed besides specimens which obviously belong to a new genus which is being published elsewhere. The dorylaims, which were approximately 20–51.4% of the total population, included species of the genera Longidorus (Micoletzky, 1922) Filipjev, 1934; Xiphinema Cobb, 1913; Dorylaimus Dujardin, 1845. Enchodelus Thorne, 1939; Trichodorus Cobb, 1913; and Mylonchulus (Cobb, 1916) Pennak, 1953. The total population of nematodes was relatively high during July-September 1979. During this period the number of tylenchid nematodes was also high. The total population of nematodes including that of tylenchids was found to be highest during September 1979, with the former and the latter reaching 137 and 58 nematodes per 30 liters of water respectively. Top |