Dr. A. H. BARADSAPTESHWRIYA SHIVAM V.2022-05-062022-05-062020https://krishikosh.egranth.ac.in/handle/1/5810184348The 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.EnglishThesis