Bioassay studies on the efficacy of cow urine based natural formulations on preference, fecundity and mortality of mustard aphid, Lipaphis erysimi (Kalt.)

摘要

In the present scenario, to combat the injudicious and indiscriminate use of hazardous chemicals in an agriculturalecosystem, eco-friendly traditional based management practices are essentially required to conserve beneficial insects and tobreak off insecticide resistance. Therefore, a preliminary bioassay study was conducted on the bioactivity of cow urine basednatural formulations such as cow urine, jivamrit, neemastra, agniaastra, dashparni, panchgavya @1%, 3% and 5% againstpreference, fecundity and mortality of mustard aphid, Lipaphis erysimi (Kalt.) using leaf dip method under laboratory conditionsat G.B. Pant University of Agriculture and Technology, Pantnagar. In preference test, all the tested natural formulations werefound very effective to repel the mustard aphids. Neemastra showed no attractancy for aphids with the least orientation towardsthe leaf discs treated with agniastra (0.33) followed by dashparni and panchgavya (1.00 each) with the highest mean aphidattractancy towards untreated control (13.67) after 48h of exposure in choice test. The mortality of gravid females was foundmaximum ranged from (76.67% to 96.67%) at the highest concentration @ 5% of natural formulations with less femalefecundity in agniastra (1.00), dashparni (2.00) with no fecundity recorded in panchgavya treated mustard leaves and maximumfemale fecundity (7.00) was observed in untreated mustard leaves after 24h of exposure. The natural formulations used at thehighest concentration @ 5.0% were found highly detrimental against tested aphids as cent-per cent nymphal mortality wasrecorded in dasparni, jivamrit, panchgavya and 96.67% mortality was recorded in neemastra and agniastra followed by cowurine (80.00%) with the least (6.67%) nymphal mortality was recorded in untreated control. Thus, this preliminary bioassay study clearly revealed the bioactivity of tested cow urine based natural formulations against preference, fecundity and mortality of mustard aphid but further in depth studies are essentially required to explore the efficacy of these eco-friendly, cost effective, easily available natural formulations against mustard aphid for its better management.