Developmental Biology of Cardiochiles nigricollis Cameron a Larval Endo-parasitoid of Rice Leaffolders

nigricollis cardiochiles Cameron is a larval endo-parasitoid of Cnaphalocrocis medinalis (Guenee) and Marasmia exigua Butler, two rice leaf folder species. On the host C. medinalis, the developmental biology of C. nigricollis was investigated. The parasitoid usually parasitized the third and fourth instar larvae of the leaffolder species. Four instars were discovered throughout the parasitoid’s growth. The first instar larvae are segmented and somewhat twisted. The tracheal system could be detected dimly in the second instar, which showed segmentation. In the third instar, the head was well defined, and the larva grew in size. Six to ei full-grown larvae emerged from the host. After the egg was laid, it took a few days for it to hatch. On average, females had a 5.3-day pupal period, whereas males had a 6.7-day pupal period. The duration of incubation, larval development, and pupal development was 1.2 days, 10 days, and 6.7 days, respectively. The pupal stage of C. nigricollis began in late August and developed progressively until the first week of December, when the entire population went into diapause. Only during the wet season was this phenomenon noted. Males took an average of 213 days to emerge from diapausing pupae, whereas females took an average of 224 days. The consistent rise in the number of C. The occurrence of a heterogeneous population of C. nigricollis in the field that responded to changes in air temperature over time could be attributed to nigricollis entering diapause in the field population. On the pupae of C. nigricollis, Brachymeria sp., Orgilus sp., Trichomalopsis (Eupteromalus) parnarae Gahan, and Elasmus sp. were grown as hyper-parasitoids.

Author (s) Details

K. S. Behera
ICAR – National Rice Research Institute, Cuttack -753006, India.

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