Mangement of White Grubs through Insecticides

Five insecticides viz., acephate (0.480 kg a.i. ha⁻¹); chlorpyriphos (0.400 kg a.i. ha⁻¹) diazinon (0.400 kg a. i. ha⁻¹), endosulfan (0.400 kg a.i. ha⁻¹) and phorate (2.500 kg a.i. ha⁻¹) were evaluated for the control of white grubs. Plant damage recorded at 80 DAS in potato crop indicated that no significant difference was found between insecticidal treatments and control (7.33% of plant mortality). However, lowest plant damage (3.66%) was recorded in plots treated with phorate 10 G (2.5 kg a.i. ha⁻¹). Per cent tuber damage at harvest was minimum in the phorate treated plot (37.50%) compared to untreated check (70.0%). On comparing yield data at harvest all the insecticidal treatments were significantly superior over untreated control (95.83 q ha⁻¹). Maximum yield (158.33 q ha⁻¹) was recorded with phorate 10 G (2.5 kg a.i. ha⁻¹) followed by chlorpyriphos 1.5% dust (0.400 g a.i, ha⁻¹) i.e. (150 q ha⁻¹).