Comparative Life Tables of <I>Micraspis discolor </I> (Fabricius) When Fed on <I>Aphis craccivora </I>(Koch) and <I>Lipaphis erysimi </I>(Kaltenbach)
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Abstract
Micraspis discolor (Fabricius) (Coleoptera: Coccinellidae) is a predaceous coccinellid playing role significantly on the control of various pests in rice and cultivars. This beetle is arranged as non-specific prey but prey choice is significantly occurred when many preys were present. In augmentative program of this beetle, the suitable pray on the basis of qualitative data on developmental parameters needs to be concerned and more understood. Therefore, the comparison of life tables on M. discolor when fed on Aphis craccivora (Koch) and Lipaphis erysimi (Kaltenbach) was carried out in order to quantify the relative suitability of those 2 aphid species. The results showed that the total periods of beetle development from egg to adult of M. discolor fed on A. craccivora and L. erysimi were 15.24±0.86 and 14.45±1.06 days, respectively. The biological life table of M. discolor fed on A. craccivora revealed that the net reproductive rate of increase (Ro) was 12.8262, the capacity for increase (rc) was 0.1255, the cohort generation time (Tc) was 20.3385 days, and the finite rate of increase (l) was 1.1337. Adult beetle began laying egg at the 3rd day after emergence and the laying period was 9 days with the highest peak of laying at the 6th day after emergence. Meanwhile, those fed on L. erysimi revealed that the net reproductive rate of increase (Ro) was 6.3000, the capacity for increase (rc) was 0.1107, the cohort generation time (Tc) was 16.6190 days, and the finite rate of increase (l) was 1.1171. Adult beetle began laying egg at the 2nd day after emergence and the laying period was 10 days with the highest peak of laying at the 3rd days after emergence. The partial ecological life table showed that the highest mortality of M. discolor was found in the first instar larva when fed on both aphid species. However, the survivorship curves of M. discolor fed on A. craccivora and L. erysimi were Type II and Type III, respectively. The result indicated that A. craccivora was suitable for rearing M. discolor.
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