STUDIES ON POD BORERS OF DOLICHOS BEAN, Lablab purpureus L. (Sweet) AND THEIR MANAGEMENT
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Date
2009-07-15
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University of Agricultural Sciences, Bangalore
Abstract
A total of eight different pod borers belonging to different genera have
been recorded on Dolichos bean under Bengaluru condition. Among them,
Helicoverpa armigera was found to be major and its incidence was
comparatively more than the other pod borers such as Adisura atkinsoni,
Sphenarches caffer, Maruca testulalis, Etiella zinckenella, Exelastis atomosa,
Lampides boeticus and Callosobruchus chinensis which were recorded at low
incidence level. Maximum diversity (H=2.00) was observed among the pod
borers on third week of December as measured by using Shannon Weiner index
of diversity. All the pod borers have shown negative correlation with maximum
temperature and rainfall while positive with relative humidity. H.armigera was
found to be relatively more abundant with 17-71 % incidence.
Among the indigenous materials, GCK (0.5%) was found to be very
effective with respect to larval reduction (58.62%), pod damage (19.56%), seed
damage (28.11%) and pod yield (8.3 q/ha) and among the new insecticide
molecules, flubendiamide 24% + thiacloprid 24-48% SC was proved to be very
effective with respect to larval reduction (79.25%), pod damage (13.13%), seed
damage (18.41%) and pod yield (16.35 q/ha). Highest net returns obtained with
GCK (Rs.4500) and Indoxacarb (Rs.10250). However, GCK (0.5%) and
Fenvalerate 20 EC have been recorded highest BC ratio of 13.26 and 7.14
respectively among indigenous materials and new insecticide molecules.
GL 248, GL 45 and GL 133 was proved to be highly resistant germplasms
which recorded 00-15.15 % pod damage and first two lines were non preferred
for oviposition which received a mean of 1.36 and 5.28 eggs per 10
inflorescences, respectively. Pod texture and fragrance have shown significant
relation with larval boring while foliage colour has shown significant relation
with oviposition.
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