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Parasitic Wasps In Guizhou Tea Garden And Their Control On Host Populations

Posted on:2017-02-24Degree:MasterType:Thesis
Country:ChinaCandidate:X R ZhangFull Text:PDF
GTID:2353330503971279Subject:Pesticides
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Tea pests in Guizhou tea garden are various and the lepidoptera and coleopteran family dominate. And the tea Caterpillar and Inchworm(Lepidoptera family) are the dominant pests in Guizhou, leading to serious quality and yield losses in the host tea. Of all the methods regarding control for tea pests on tea plant, chemical control shows low cost and quick effectiveness, but takes the risk of pesticide residue and easy influence by trade barrier, however, both physical and agricultural control show high security but limited effect. Biological control, which has been strongly advocated in pests control recently, possesses better safety and control effect.The dissertation collected the tea caterpillar egg mass of winter and normal season to investigate the infested with wasp. Meanwhile, it acquired the parasitic wasp by collecting tea garden lepidoptera pest's eggs. The dissertation identified species through the male genitalia of parasitic wasp and used the experimental population life table to screen the advantage wasp species, to build the parasitic wasp population indoor, and to conduct artificial propagation and breeding, which laid foundation for preparing a large number of parasitic wasps for control of tea garden pests.The results of winter and normal season tea caterpillar egg mass survey showed that the average parasitic rate on overwintering egg mass of tea caterpillar reached 95.72%, and that of the normal season egg mass was accounted for only 10.70%. By means of the male genitalia morphological, the dissertation identified the T.euproctidis Wilcox parasitic wasp species in Guizhou and two wild species of Guizhou as follows: T.embryophyagum and T.closteroe. Results of T.embryophyagum and T.closteroe on rice moth egg parasitic potential by Experimental population life table showed that both species are suitable for rice moth eggs as intermediate host of breeding, and also suitable for artificial reproduction.Results of searching for the T.euproctidis Wilcox in the middle of the host egg test showed that: rice moth eggs, tussah silkworm eggs, prodenia litura eggs, and capsid cugblind eggs are not able to be parasitized successfully by T.euproctidis Wilcox. So far, we can only use tea caterpillar eggs to replace T.euproctidis Wilcox to parasitic in our laboratory, which has unsatisfactory economic feasibility. Also, results of T.euproctidis Wilcox and T.chilonis on the tea caterpillar eggs parasitic potential by Experimental population life table showed that T.euproctidis Wilcox is the dominate parasitism species, and deserves further research.The dissertation tested the eclosion rate of refrigerated three parasitic wasps from Guizhou, results of which showed that: T.chilonis' s suitable for refrigeration for 28 days and its optimum development days before being refrigerated is 7d and 8d. T.ostriniae's suitable for refrigeration days for 35 d and its optimum development days before refrigerated is 7d. T.leucaniase's suitable for refrigeration days for 28 d and its optimum development days before refrigerated is 6d. The parasitic situation of three parasitic wasps in Guizhou on the tussah silkworm eggs showed that the tussah silkworm eggs are of great value in T.chilonis' thriving artificial reproduction. While rice moth eggs are appropriate in artificial reproduction of the T.leucaniase and T.ostriniae.Results of the Field release parasitic wasps to control the tea caterpillar test showed that the control effects reached to 60%-70%, which achieved the expected effection. The results of the dissertation may provide technical reference and lay certain foundation for the biological control of tea garden on lepidoptera pests in Guizhou.
Keywords/Search Tags:Tea garden, biological prevention and control, tea caterpillar black egg bees, parasitic wasp, control effect
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