A host (Corcyra cephalonica / Maruca testulalis) parasitoid (Bracon hebetor) ratio of 2:1 was found to result in higher parasitisation, though the production of females was equal in all the ratios tried. Parasitisation was found to be higher in fourth instar larvae in both the host insects. Three mated female parasitoids per ten host larvae resulted in the best utilisation of the larvae supplied as became evident from the relatively high parasitisation and production of female parasitoid.
The biology of pomegranate fruitborer, Deudorix isocrates was studied at the Horticultural Research Station, Yercaud, Tamil Nadu. The females laid the eggs on flowers, fruits, stem, stalk and on leaves either singly or in groups of 2 10 7. The total developmental period from egg to adult emergence ranged from 33 to 41 days with 5 larval instars. The egg. larva, prepupa and pupal periods ranged from 4 to 7, 19 to 25, 2 to 3 and 7 to 10 days respectively. The adult longevity. prcoviposition and oviposition period varied from 7 to 11, 3 to 5 and 3 to 6 days with an average fecundity of 31.4 eggs/female. The life table studies indicated that the net reproductive rate (Ro) was 14,68 and the mean generation time (Te) was 44.72 days.
The influence of different hosts on the biology of adults of Trichogramma chilonis (Ishii) was tested in the laboratory. T.chilonis showed highest preference for the eggs of Pthorimoca operculella as shown by highest parasitisation (76.2%), adult emergence (96.33%) females (55.31%) and longevity (6.4 days)
A morfologia geral, histologia e mudanças cíclicas no ovário de Colisa fasciatus foram descritas. 0 ovário apresenta um tipo assincrônico de desenvolvimento ovocitário, com um só pico de desova que se estende de junho a agosto. 0 ooplasma, núcleo e constituintes da parede celular exibem distintas mudanças morfológicas e histológicas durante seu ciclo anual. 0 aparecimento de núcleos de vitelo, extrusões nucleolares e deposição de vitelo foram discutidas.
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