Biology of Exorista xanthaspis, an important parasite of Dendrolimus punctatus
1988
Ma Wanyan | Peng Jianwen | Wang Xilin (Hunan Inst. of Forestry, Changsha (China))
Exorista xanthaspis Wiedemann has 5-6 generations a year, overwintering in the soil. The parasitic rate of the 1st, 2nd and 3rd generations of D. punctatus by the fly was 21.37%, 44.95% and 0.71%, respectively. About 95% of the eggs were laid on the prothoracic legs of the host larvae of advanced instars. The number of eggs per host varies from 1 to 33, with a maximum of 11 eggs hatched. The host would die gradually in its larval or pupal stage, once it received 7-20 eggs of the parasite. But 3% of the attacked hosts could survive when they had an average of 2.5 eggs each. The population dynamics of E. xanthaspis in fields was found to be positively correlated with the temperature of May, but negatively correlated with that of late July to early August.
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