Evaluation of rapeseed mustard genotypes and insecticides for the management of mustard aphid
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Date
2011
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CCSHAU
Abstract
Studies on evaluation of rapeseed–mustard genotypes for their susceptibility to mustard aphid,
Lipaphis erysimi (Kalt.)and its management with chemical insecticides were conducted during Rabi,
2010-11 at research farm of Chaudhary Charan Singh Haryana Agricultural University, Hisar. Fifty
advanced rapeseed-mustard genotypes were sown in a Randomized Block Design on November 8,
2010, for their reaction to the pest. Based on pooled average of aphid infestation index (AII) at full
flowering and full pod formation stages, out of fifty advanced rapeseed-mustard genotypes, four
genotypes (Ashirwad, Parasmani-2-10, BAUM-2007, and RH-7846) were found resistant having aphid
infestation index upto 1.6. Maximum AII was found in BSH-1(4.3). Development of mustard aphid was
studied on ten different rapeseed-mustard genotypes under laboratory conditions at grown up and
flowering stage of plant. On genotype BSH-1 at grown up stage (leaves), nymphal period, reproductive
period, adult longevity and total lifespan were minimum with 8.1, 15.7, 18.5 and 27.0 days,
respectively. However on same genotype fecundity was maximum with 99.8 nymphs/female and per
cent survival as 96 per cent. On the other hand on Purple Mutant nymphal period, reproductive period,
adult longevity and total lifespan were maximum with 9.6, 17.1, 21.0 and 30.7 days, respectively.
Fecundity and survival was minimum with 76.2 nymphs/female and 75 per cent, respectively. Similar
trend was observed for these parameters at flowering stage (inflorescence) on the genotype Purple
Mutant and BSH-1. Size and weight of aphid (nymph and adult) were maximum on BSH-1 and
minimum on Purple Mutant. Among the insecticide treatments tested under field condition,
imidacloprid at 0.003 and 0.002% concentration was found most effective, followed by methyl demeton
and dimethoate. Highest cost benefit ratio was observed in case of imidacloprid (0.003%) with 1:18.0
followed by imidacloprid (0.002%) with 1:17.9 and minimum was observed in case of fipronil
(0.008%) with 1:2.2.
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Keywords
Sowing, Vegetative propagation, Germinability, Developmental stages, Biological phenomena, Biological development, Pruning, Planting, Biomass, Extraction