Nematicidal impact on the embryogenesis of Cephalobus persegnis

Abstract

The impact of nematicides viz., carbofuran, phorale, posse, aldicarb and endosulfan was tested on the embryogenesis of Cephalobus persegnis. The nematicides enhanced the cmbryonation period with the maximum effect being for endosulfan and minimum for carbofuran and phorate. In 50 ppm concentration hatching could not take place only in eggs treated with endosulfan. Development did not proceed beyond gastrulation in single celled eggs treated with 100 and 150 ppm of all nematicides. However. the development continued up to late pretzel stage if the eggs were treated at gastrula stage. The nematicides at 200 ppm drastically affected the developmental process.