Distribution of Plant Parasitic Nematodes in the Soybean (Glycine max) Growing Areas of India

A survey was carried out to study the distribution of plant parasitic nematodes in the soybean growing areas of India. Soil samples were collected from the rhizospheres of soybean across the country. Population analysis of 58 soil samples representing 23 districts of 14 states revealed the presence of Helicotylenchus sp. (Spiral nematode), Rotylenchulus sp. (Reniform nematode), Pratylenchus sp. (Lesion nematode), Hoplolaimus sp. (Lance nematode), Tylenchorhynchus sp. (Stunt nematode), Heterodera sp. (Cyst nematode), Rotylenchus reniformis (Spiral nematode), Hirschmanniella sp. (Root nematode), Meloidogyne sp. (Root Knot nematode) and Trichodorus sp. (Stubby Root nematode) with varying population densities. Among the different plant parasitic nematodes recorded, spiral nematodes were found to be most widely distributed as it recorded from 39 (67%) samples, whereas Lance, Lesion, Reniform, Stunt and Cyst nematodes were recorded from 28 (48%), 27 (47%), 26 (45%), 11 (19%) and 7 (12%) samples respectively. Based on the prominence value (PV), Reniform nematode (PV: 410) was found to be more important followed by Spiral (PV: 362), Lesion (PV: 202), Lance (PV: 173), Stunt (PV: 88) and Cyst (PV: 8.5) nematodes in the same order. The map on the distribution of plant parasitic nematodes in the soybean growing areas of India was prepared based on the survey.