Observations on some general characteristics of the reproduction of Bracon greeni Ashmead (Braconidae, Hymenoptera).
1988
Lai Yongqi | Wang Shizhen
The white grub, larva of Eublemma amabilis Moore is a serious pest causing loss of raw lac in the production areas in the world. The most effective measure to cope with it has been proved to be biological control taking advantage of Bracon greeni Ashmead an ectoparasite of the grub. The general characteristics of reproduction of this braconid, such as supplementary nutrient for egg-ripening, habits of egg-laying, fecundity, sex ratio etc. are studied in laboratory in 1979-1983. Some conclusions drawn are the following: 1. The adult of the braconid needs a sufficient amount of honey as supplementary nutrient for egg-laying through its life. 2. The female is able to find its host under cover with tiny mesh, which is necessary for egg-laying, by smell of the excrement of the grub or the body itself and by the feeling with its ovipositor. But it lacks the ability to distinguish true host from false in laboratory. 3. The range of reproduction period and egg number are directly related with the longevity, the longest being 211 days with an average of 119.5 days. And it is found that the longevity decreases generation after generation in laboratory. 4. The sex ratio of the braconid is about 3:1 in nature and the males become more in number in laboratory, for example, in the first generation on the ratio is 1.2:1 in the second 0.7:1 and in the third 0.4:1.
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