BIO-ECOLOGY AND EVALUATION OF INSECTICIDES AGAINST MEALYBUG, Ferrisia virgata (Cockerell), INFESTING CUSTARD APPLE
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Date
2020
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DEPARTMENT OF AGRICULTURAL ENTOMOLOGY B. A. COLLEGE OF AGRICULTURE ANAND AGRICULTURAL UNIVERSITY, ANAND
Abstract
The mealybug, F. virgata found as major pest on custard apple. It was
indicative from the studies on biology of F. virgata on custard apple leaves that the
average incubation periods of eggs were 46.34 ± 6.96 minutes with 92.96 ± 2.09 per
cent egg hatching. The average first, second and third instar of female nymphal
periods were 7.08 ± 1.04, 7.18 ± 1.11, 7.08 ± 0.96 days, respectively. The average
first, second, third and fourth instar of male nymphal periods were 8.11 ± 1.52, 8.78 ±
2.14, 4.11 ± 1.09, 4.56 ± 1.16 days, respectively. The pre-oviposition, oviposition and
post oviposition periods of F. virgata were 6.57 ± 0.93, 8.78 ± 0.76 and 1.57 ± 0.49
days, respectively. The longevity of adult female and male were 23.10±2.04 days and
25.10 ± 3.29 days. Total life spans of female and male were 49.42 ± 1.69 days and
27.78 ± 4.84 days on custard apple leaves.