STUDIES ON PREFERENCE OF Callosobruchus maculatus Linnaeus ON VARIOUS CHICKPEA VARIETIES AND ITS MANAGEMENT WITH EDIBLE OILS
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Date
2018
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Acharya N.G. Ranga Agricultural University
Abstract
The present study entitled “Studies on preference of Callosobruchus
maculatus Linnaeus on various chickpea varieties and its management with edible
oils” was carried out under laboratory conditions at the Department of Entomology, S.
V. Agricultural College, Tirupati during the year 2017-18.
The performance of 16 chickpea genotypes was assessed based on the
biological parameters of the test insect and seed damage. The genotypes NBeG-49
and NBeG-47 which recorded index of susceptibility (IS) of 0.9 and 1.3 were
categorized as resistant genotypes, while seven genotypes viz., Vihar, NBeG-3,
NBeG-119, NBeG-511, JAKI-9218, NBeG-452 and ICCV-2 with the index of
susceptibility (IS) ranging between 4.3 to 6.7 as moderately resistant to the bruchid
attack and the rest of the seven genotypes viz., NBeG-458, NBeG-399, JG-11, NBeG-
471, NBeG-507, ICCV-2 and NBeG-732 with the index of susceptibility (IS) ranging
between 7.6 to 8.7 as susceptible genotypes against C. maculatus.
The germination percentage of infested seeds of 16 chickpea genotypes were
significantly different from each other. The genotypes with less infestation recorded
highest germination percentage (96.67%) over the heavily infested seeds (23.33 %)
which recorded less germination percentage.
Among the various physical parameters, colour, size and surface texture of the
seed played a major role on the oviposition preference of the test insect. The varieties
with creamy white colour and tuberculated smooth textured were preferred more for
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oviposition than the brown colour and rough surface seed. The length of seed, width
of seed and test weight of seed had influence on per cent infestation of the test
genotypes. The chemical constituents such as low aminoacids, carbohydrates and
proteins of the test genotypes were detrimental to the growth and development of the
bruchids.
The genotypes with differential reaction had affected the biology of test insect.
The resistant genotypes NBeG-49 and NBeG-47 recorded lowest number of eggs, less
per cent adult emergence, less mean development period and growth index over the
susceptible genotypes NBeG-458, NBeG-399 and JG-11.The moderately resistant
genotypes Vihar and NBeG-3 were intermediate in between resistant and susceptible
genotypes.
Ovipositional preference of C. maculatus on selected genotypes of chickpea
under free choice condition varied significantly. The genotypes JG-11 (9.67 %),
NBeG-458 (11.00 %) and NBeG-399 (12.00 %) recorded more number of eggs over
NBeG-49 (3.33 %) and NBeG-47 (5.00 %). The genotypes Vihar (8.67 %) and
NBeG-3 (8.00 %) were intermediate in position.
The edible oils used in the study indicated that all the oils viz., groundnut,
mustard, sesamum, olive, rice bran and sunflower were effective at 1ml/100g seed
concentration which recorded less number of eggs, less per cent adult emergence,
MDP (mean development period) and high oviposition inhibition percentage. Among
them groundnut and mustard oils were effective at 0.5ml/100g seed.
The oils and concentration levels had effect on seed germination. All the oils
were recorded less germination percentage over control (70.00 %). There was no
significant difference between the oils with respect to germination percentage of
seeds.
Description
D5711
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