Nematicidal effect on post-embryonic processes of Cruznema tripartitum (Nematoda)

Abstract

The effect of aldicarb, carbofuran and phorate at concentrations of 25, 50, 75, 100, 125 and 150 ppm was studied on freshly hatched juveniles of Cruznema tripartitum. The nematicides prolonged post-embryonic development but reduced the fecundity and reproductive period by affecting the moulting and egg laying processes. The survival time was also reduced in the treated specimens. No intra-uterine development was observed in the adults developed from the treated juveniles. In separate experiments, when fertilised young (2-3 days) and old (7-8 days) females were exposed to the same set of nematicides, the older females showed a strong tendency of retention of eggs. However, the majority of such eggs were non-viable and did not develop.