BIODIVERSITY OF PLANT PARASITIC NEMATODES ASSOCIATED WITH COTTON IN KHAMMAM DISTRICT OF ANDHRA PRADESH, INDIA

Cotton (Gassypium spp) is one of the most important economical crops among the different economical crops in the agriculture and it is intensively cultivated in all over the parts of India especially in middle part of Andhra Pradesh, India.A total number of 51 each soil and root samples were collected from Various parts of Andhra Pradesh in Khammam, Sathupally, Wyra, Madhira, Palair constituency of Khammam District of Andhra Pradesh, India during August 2012 to November 2012.Covering a range of soil types such as clay ( 12), sandy loam (09), red soil ( 14), Black soil (16), were processed and nematodes populations were assessed.In the present study revealed that the all areas of root lesion nematodes (Reni form nematode) Rotylenchus reniformis was the predominant species found to occur in maximum number of root samples (33/51) and it has the highest prominence value of 1237.2, 1981.7,1319.6,2922.7 and 1981.0(Table 1) with admiration to 5 constituency followed by root knot nematode (Meloidogyne inconitga) and Lesion nematode (Paratylenchus pratensis) maximum percentage occurrence of Rotylenchus reniformis was recorded from red soil (89.00 %), black soil (63.00 %) clay (43.00 %) followed by sandy loam (34.00 %) (Table 3), Analysis of the soil sample revealed the presence of 08 genera of plant parasitic nematodes.