Effect of granular nematicides on the biology of Heterodera Cajani of pigeonpea

Application of some granular nematicides such as phorate 10G, aldicarb 10G and carbofuran 3G at the rate of 2.5 mg a.i./Kg soil reduced the entry of H. cajani in roots of pigeonpea. The development of the nematode was also delayed by all these nematicides. Maximum adverse effect on penetration, reduction in development, eggs/egg-sac of H. cajani was produced by aldicarb followed by carbofuran and phorate. All the nematicides decreased the final population of the nematode. The browning of cysts was also delayed by all nematicides.