POPULATION DYNAMICS AND MANAGEMENT OF DEFOLIATOR PESTS OF CABBAGE
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Date
2000
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University of Agricultural Sciences, Dharwad
Abstract
Seasonal abundance studies indfcated that maximum population (24.18)
larvae/plant) of diamondback moth (DBM), Plutella xylostella (L.) was noticed during
third week of January in rabi season and it was lowest (0.13 larvae/plant) during
third week of April to first week of May in summer season. Minimum population
(0.15) of tobacco caterpillar. Spodoptera litura Fab. was noticed during third week of
November and attained peak (12.05) in the same season (rabi) between first week
to third week of January. Whereas the peak population (6.95) of cabbage leaf
Webber, Croddolomia binotalis Zell, was observed in first week of September in
kharif and lowest population (0.45) was observed in first week of May in summer
season. While, maximum population (10.69) of cabbage head borer, Hellula undalis
(Fab.) was noticed during third week of April in summer season and lowest
population (0.01) was observed during first week of August in kharif.
Among the new insecticides tested in field, spinosad @ 0.048%, fipronil @
0.005%, lufenuron @ 0.005%, novaluron @ 0.01%, fiufenoxuron @ 0.01% and
thiodicarb @ 0.15% in that order proved significantly superior in reducing the larvae
of P. xylstella, S. litura, C. binotalis throughout the crop period. However, lufenuron,
novaluron, spinosad, fiufenoxuron and carbosuifan @ 0.025% proved superior in
that order against cabbage head borer.
With respect to ovidical toxicity all the tested new chemicals except fipronil
exhibited good ovicidal action against 0-24, 24-48 and 48-72 hrs old eggs of P.
xylostelia, S. litura, C. binotalis and H. undalis.
Of the modules of IPM evaluated, adoptable module with mustard trap crop
was found to be the best in reducing the pest load on cabbage crop, increasing the
yield tremendously compared to biointensive module and RPP. Mustard plants
effectively trapped P. xylostelia, C. binotalis and H. undalis population. This module
also recorded higher benefit cost ratio of 4.17 over RPP.
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No . of references 144