VARIATION IN THE POPULATION AGE STRUCTURE AND ITS INFLUENCE ON THE ADULT ACTIVITY IN Corcyra cephalonica (STAINTON) (LEPIDOPTERA: PYRALIDAE)
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Date
2017-08-08
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
During the present investigation, intra-generation accumulation of variation in
age-structure and effect of accumulated variation on adult emergence and activity pattern
in Corcyra cephalonica was studied. Variation in developmental period at different
stages of Corcyra was studied using same day laid eggs.
At the egg stage 5 days of variation in developmental period was noticed.
Considerable variation (head capsule width) among the individuals was also noticed
during the larval stage. Head capsule width was measured at every four days.
Accumulated variation in head capsule width increased from 0.0009 during first sampling
to 0.029 at last sampling. However, coefficient of variation was almost same throughout
the larval period. Moths started emerging on 52nd day of egg inoculation. Male moth
emerged first (52nd day) followed by females on 54th day, suggesting occurrence of
protandry in C. cephalonica. Moth emergence continued upto 113th day of egg
inoculation. In entire population 68.9% females were mated and 31.1% remained
unmated. Among the mated females, 76.35 % had mated once, 16.67 % mated twice,
5.18% was mated thrice, 0.45% mated four times and 1.35% mated five times. Males
completed their developmental period earlier to females, though number instars remained
same among them (7 to 8 instars). Average total developmental period was 45.3 ± 2.5 in
males and 48.9 ± 3.3 days in females, suggesting gender associated difference in
developmental period.
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