BIO-EFFICACY OF SOME INSECTICIDES AND BOTANICALS AGAINST Myzus persicae (Sulzer) ON CAPSICUM
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Date
2013
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Abstract
ABSTRACT
The present study entitled “Bio-efficacy of some insecticides and botanicals against Myzus
persicae (Sulzer) on capsicum” was carried out during 2011-2013 in the Department of Entomology,
Dr. Y. S. Parmar University of Horticulture and Forestry, Nauni, Solan (HP). Laboratory experiments
were carried out to study the intrinsic toxicity of insecticides viz., fipronil, buprofezin, diafenthiuron,
dimethoate; a horticultural mineral oil and botanicals (Neem Baan 1500 ppm, aqueous extracts of
neem seed kernels and darek drupes) against the green peach aphid, M. persicae. Among chemical
insecticides, fipronil was found to be most toxic against the test insect with LC50 value of 0.000841
per cent followed by diafenthiuron (0.001104 %), buprofezin (0.001199 %) and dimethoate (0.005362
%). The respective LC90 values were 0.005432, 0.006676, 0.005165 and 0.028921 per cent. LC50 and
LC90 values recorded for HMO were 0.5733 and 1.92 per cent, respectively. In case of botanicals,
azadirachtin (Neem Baan 1500 ppm) resulted in dosage-dependent mortality with EC50 value of
0.000516 per cent whereas the aqueous extracts of neem seed kernels and darek drupes have the
respective value of 2.68 and 11.9 per cent. The effect of these extracts on biological parameters of M.
persicae revealed that the aqueous extracts of neem seed kernels (2.5 and 5.0 %) and darek drupes (10
and 20 %) reduced the reproductive period, fecundity and adult longevity. Among the fertility
parameters, the net reproductive rate (Ro) and intrinsic rate of increase (rm) were also observed to be
effected when treated with these extracts. The respective values recorded were minimum for those
treated with 10 per cent darek (Ro: 6.14, rm: 0.217) followed by 2.5 per cent NSKE Ro: 8.4; rm: 0.257),
as against untreated aphids (Ro: 42.4, rm: 0.308).