BIO-INTENSIVE MANAGEMENT OF MUSTARD APHID Lipaphis erysimi (Kalt.)
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Date
2023
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RPCAU, Pusa
Abstract
The present investigation entitled “Bio-intensive Management of Mustard aphid Lipaphis erysimi (Kalt.)” was conducted during 2022-23 cropping season at Research Farm of Tirhut College of Agriculture, Dholi, Muzaffarpur, Bihar. The study focused on evaluation of 42 Brassica genotypes for their Resistance or susceptibility against mustard aphid (Lipaphis erysimi) and to check the efficacy of some botanicals and entomopathogens against mustard aphid population in field conditions. During the screening of 42 Brassica genotypes, overall mean population of aphids per top 10 cm of inflorescence ranged from 41.82 to 137.79. The genotypes KMR(E) 21-1 and KGMH 9198 were infested with minimum and maximum numbers of aphid population, respectively. whereas, susceptible and resistant check varieties Yellow sarson (66-197-3) and Kranti had aphid population of 137.48 and 43.48 aphids/top 10 cm of inflorescence, respectively. Based on aphid infestation index (AII), 42 genotypes were categorized into five groups viz. highly resistant, resistant, moderately resistant, susceptible and highly susceptible. Two genotypes were grouped as resistant. 11 genotypes as moderately resistant, 25 genotypes as susceptible and 4 genotypes were grouped as highly susceptible. The lowest and highest AII was recorded in KMR(E) 21-1 (1.43) and KGMH 9198 (4.03), respectively. Check varieties Yellow sarson (66-197-3) and Kranti had aphid infestation index of 3.54 and 1.96, respectively. Further phenol and total sugar contents of top six promising genotypes also shown the negative and positive correlation of the aphid infestation. Molecular identification proved the east Asian strain of mustard aphid i.e., Lipaphis erysimi pseudobrassicae.
The efficacy of various entomopathogens and botanicals was also evaluated against mustard aphid and its natural enemies. Among the entomopathogens and botanicals tested on mustard aphid, the per cent reduction of mustard aphid population over untreated control following the first and the second spray was the highest in Verticillium lecanii @ 5g/liter of water that is (85.33) followed by Beauveria bassiana @ 5g/liter of water (84.5%) and Metarhizium anisopliae @ 5g/liter of water (84.06%), Onion bulb extract @5% (77.24), Garlic bulb extract @5% (75.54) and Ginger rhizome extract @5% (74.11) respectively besides with higher population of natural enemies. However, chemical check Dimethoate 30EC @ 1ml/liter of water showed 93.8% reduction over control. Additionally based on B: C ratio Verticillium lecanii @ 5g/liter of water 2.24:1 was found to be better followed by Beauveria bassiana @ 5g/liter of water (2.20:1) and Metarhizium anisopliae @ 5g/liter of water (2.18:1).