Alang-alang gall midge potential as an alternate host for parasitoids [Indonesia]
1986
Soenarjo, E. (Bogor Research Inst. for Food Crops, Cimanggu, Kecil 2, Bogor (Indonesia))
The life cycle of Platygaster oryzae, in general, synchronizes with the life cycle of RGM (28-32 d). To study the biology of the RGM parasitoids, 1,032 samples of AGM were taken from 9 locations in West Java during 9 mo. in 1983-84. Parasitoids, particularly larvae and pupal, were present in AGM and were often found where the insect occurred. The life cycles of the larval and pupal parasitoids are relatively the same as those which live in RGM. The life cycle of P. oryzae synchronizes with the life cycles of the host. The life cycle of AGM is relatively longer (5-7 weeks) than that of RGM (4-5 weeks). The life cycle of P. oryzae on AGM is also longer than that on RGM. Based on biology and behavior, the Platygaster sp., which occurs as a dominant parasitoid of AGM, is now considered the complex of the P. oryzae of RGM. It attacks larvae of RGM, but attacks pupae of AGM because the parasite deposits eggs only when silvershoots of AGM emerge
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