Department of Entomology & Agricultural Zoology, Rjendra Agricultural University, Pusa-848125, District Samastipur, Bihar, (India).
*Address for correspondence: Head, Department of Entomology & Agricultural Zoology, Tirhut College of Agriculture, Rajendra Agricultural University, Dholi-843 121, District Muzzafarpur, Bihar, (India).
1A Part of approved Ph.D. Thesis submitted by P.P. Singh to the Rajendra Agricultural University, Pusa, Samastipur, Bihar.
Treatment of seeds of field pea, Pisum sativum L. (variety Rachna) with some insecticides used either alone or in combination with Rhizobium inoculant revealed differential effect on pest infestation and grain yield. Pre-sowing seed treatment with carbofuran 3G (15 g/kg seed) together with Rhizobium inoculation provided maximum protection (67.7–80.7%) to the crop against the pest infestation throughout the crop growth, maximised the productivity (702 kg/ha) and earned maximum economic return (Rs. 8,592/ha) over untreated control. On the other hand, phorate 10 G (5 g/kg seed) as well as acephate 75 SP (10 g/kg seed) showed incompatibility with Rhizobium culture, while monocrotophos 36 EC, dimethoate 30 EC both at 10 ml/kg seed and chlorpyriphos 20 EC (8 ml/kg seed) besides carbofuran 3G (15 g/kg seed) proved reasonably more compatible with bacterial biofertilizer.
