UTILIZATION OF BIOPESTICIDES IN THE MANAGEMENT OF POD BORER, Helicoverpa armigera Hubner ON CHICKPEA
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Date
2000
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University of Agricultural Science, Dharwad
Abstract
"Investigations on Utilization of Biopesticides in the management of Pod
Borer, Helicoverpa armigera Hubner on Chickpea were carried out at Main
Research Station, Dharwad during 1999-2000. Among, Neem Seed Kernel
(NSK) and Neem Leaf (NL) dusts at different dosages on different
developmental stages of H. armigera in laboratory and field, NSK 60% talc
based dust exhibited highest ovicidai action by recording least egg hatchability
(29.20%) and neem leaf 60% talc and chalk based showed least egg
hatchability of 35.55 and 36.60%, respectively. NSK and NL 60% talc based
dusts caused cent per cent mortality of first and second instar larvae. NSK 60%
talc based dust caused 95.44% mortality of third instar larvae and it caused
95.44 per cent mortality of fourth instar larvae. The NL 60% talc based dusts
caused 85.44 % mortality of third instar larvae whereas on fourth instar only
70.44% mortality was observed.
NSK 60% and NL 60% talc based dusts caused 63.33% and 60.00%
mortality of pupae, respectively, which were followed by NSK 50 and 60%
chalk based dusts. In field, NSK 60% dust was as effective as that of malathion
5% dust which were significantly superior over other treatments and recorded
77.74 and 74.96% larval reduction, respectively 15 days after dusting. The
least leaf let damage of 9.23% and 1 0 . 1% and pod damage of 12.38% and
12.58%; higher grain yield of 13.40 q per ha and 12.83 q per ha and more B:C
ratio 27.12 and 28.32 were recorded in these two treatments, respectively.
Nomuraea rileyi (Farlow) Samson @ 1.5 g/l was effective in reducing the
larval reduction of 67.36% and recorded the least leaf let (7.89%), pod damage
(1 2.94%) and gave highest grain yield (11.5 q/ha). The spray sequence of three
sprays of monocrotophos at vegetative, flowering and pod formation was most
effective by recording 87.27% larval reduction followed by monocrotophos -
NPV - neem which recorded 79.22% larval reduction. The plot treated with
three sprays of monocrotophos recorded lowest leaf let (7.27%) and pod
damage (10.34%) with higher grain yield (14.33 q/ha) which was followed by
NPV _ neem - monocrotophos. The highest B : C ratio of 20.38 was observed
in NPV - neem - monocrotophos"
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