Indian Journal of Nematology

Toxicological tests with different concentrations of DBCP and exposure of Pratylenchus zeae, Tylenchorhynchus vulgaris and Hemicriconemoides cocophillus revealed that the percentage mortality was directly proportional to both concentration and exposure period. There is almost complete kill of all three species when exposed to 160 ppm or more for atleast 24 hours. Using CTP as parameter, T. vulgaris was found to be more susceptible to DBCP exposure as compared to P. zeae and H. coyophillus. Further P. zeae was found to be more susceptible at 20°C than at 10° or 30°C. Similarly, larval emergence for cysts of Heterodera cajani was proportionately affected with an increase of DBCP concentration and exposure period. Larval emergence was reduced to 9.5, 4.8 and 0.8 per cent in 640 ppm for 2, 4 and 8 days respectively as against 41.0 per cent emergence in check treatment.