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Subject: Agricultural Entomology ×

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    ThesisItemOpen Access
    Management of aphid (Lipaphis erysimi using eco-friendly approaches in mustard
    (Department of Entomology, BAU, Sabour, 2017-08) Kumari, Annu; Vishwakarma, Ramanuj
    The present investigation was carried out at Research Farm of Bihar Agricultural University, Sabour, Bhagalpur, Bihar, India during 2015-16 and 2016-17. Three experiments namely, screening of the germplasms against mustard aphid, L. ERYSIMI efficacy of different botanicals and effect of different border crops on population of mustard aphid have been carried out. Seventy seven germplasms were evaluated against mustard aphid (L. ERYSIMI), and out of them, germplasm IC491089 was found resistant (field tolerant) with aphid population of 21.3 -30.7 aphids/plant. The germplasm IC385703 was highly susceptible against mustard aphid and found to range from 87.0-195.3 aphids/plant. There were 4 germplasms found under resistant category, 3 germplasms under moderately resistant, 54 germplasms under susceptible and 16 germplasms under highly susceptible. About 70% germplasm were susceptible against mustard aphid. The aphid infestation in mustard crop was observed from flowering stage and reached at peak during pod formation stage, afterwards it declined in all the germplasms. Efficacy of 1% leaf extract of neem, calotropis, chrysanthemum, lanata, parthenium and thiamethox am (0.008%) was assessed against mustard aphid under filed conditions during both the years. Among botanicals, lantana leaf extract @ 1% was found best for managing mustard aphid with appreciable yield as compared to other botanicals, while thiamethox am was found at par. The order of the efficacy of botanicals against aphid was lantana > neem > calotropis > parthenium > chrysanthemum. According to yield parameter, the order of botanicals was lantana > neem > parthenium > chrysanthemum > calotropis. Effect of different border crops VIZ. safflower, red giant mustard (RGM), coriander, onion and maize was observed on population of mustard aphid and its natural enemies. Among the border crops, the least number of aphids were in safflower bordered plot with highest yield followed by maize. Further, the number of coccinellid/plant was observed 8.86 times more in safflower bordered plot on last date of observation during first week of March as compared with first date of observation in the last week of January.