Yadav, S.S.Sonu Kumari2019-11-202019-11-202019http://krishikosh.egranth.ac.in/handle/1/5810135759A laboratory experiment was conducted on “Studies on biology, varietal screening and management of pulse beetle, Callosobruchus chinensis (L.) on mung bean” at Storage Laboratory in Department of Entomology, College of Agriculture, CCS HAU, Hisar during 2018-19. The biology of pulse beetle, C. chinensis was studied on mung bean variety MH 421. The study on the biology of pulse beetle, C. chinensis showed that total developmental period (egg to adult) was 32.73 ± 2.96 days. The eggs of C. chinensis were oval and planoconvex in appearance. Freshly laid eggs are smooth, translucent and white in colour. Average female and male ratio was recorded as 0.83:1.21 indicating little dominance of male over female population. Out of the ten varieties of mung bean screened for their ovipositional preference, population growth, grain loss and weight loss by the pulse beetle, C. chinensis. Pusa Ratna was the least preferred variety by pulse beetle, C. chinensis (L.) while SML 668 was most preferred variety. The population growth of C. chinensis was found highest in variety SML 668 (414.50 adults) whereas lowest was found in Pusa Ratna (251.83 adults). Pusa Ratna and Basanti had lowest grain damage (34.82 % and 36.57 %, respectively) with minimum loss in weight (15.31 % and 17.27%, respectively). SML 668 and Pusa Vishal had highest grain damage (49.04 % and 46.93%, respectively) with maximum loss in weight (30.52 % and 27.09 %, respectively).The management practices comprising seed protectants were evaluated against pulse beetle, C. chinensis. The treatment evaluated were neem oil, neem leaf powder, mustard oil, groundnut oil, turmeric powder, custard apple seed powder, mentha oil, lemongrass oil and control at the different dose per kg seed. Both neem leaf powder and neem oil were found most effective protectants resulted in highest adult moratilty (92.22 per cent and 90.55 per cent, respectively), lowest damage of grain and weight loss being 0.88 and 0.97 per cent and 0.68 and 0.73 per cent, respectively in both the treatments, followed by mentha oil (2.5ml/kg) and lemongrass oil (2.5 ml/kg). The seed germination per cent was observed to be highest in the treatment of neem leaf powder and neem oil. No adverse effect of seed protectants was observed on mung bean seed.ennullThesis