关键词: 椰心叶甲啮小蜂, 椰心叶甲, 生物学特性, 形态, 存活, 繁殖, 发育起点

Abstract: Tetrastichus brontispae Ferrière, an important endoparasitoid of the coconut leaf beetle Brontispa longissima(Gestro) at pupal stage, was introduced into Hainan from Taiwan in 2004 Morphology, behavior, development, survival and reproduction of the parasitoid were studied under laboratory conditions. The results showed that T. brontispae female was bigger than male in body size, with obvious ovipositor. The number of parasitoid emerged from each host was averaged 21.5 with 77.4% females. The wasps could mate soon after emerging, and the mating behavior last 1-2 min. The peak of oviposition occurred 24 h after mating, and the temperature could affect the oviposition in the wasp. Sweet resources such as honey, sucrose, and glucose, especially honey, could prolong the longevity of adults, increase the fecundity and parasitism of females effectively. Laboratory experiments showed that the optimal temperature for development, survival, and reproduction of the parasitoid ranged from 20℃ to 28℃, and the temperatures below 16℃ or above 30℃ were unfavorable for its survival. The developmental threshold and the effective accumulated temperature of T. brontispae were 9.6℃ and 324.9 daydegrees, respectively.

Key words: Tetrastichus brontispae, Brontispa longissima, biological characteristics, morphology, survival, reproduction, developmental threshold