Thesis Abstract of AGS Students
Ecological study of the Asian corn borer, Ostrinia furnacalis (Guenee), in Yunnan, people’s replublic of china
Zhengyue Li (1996)
The ecology of Ostrinia furnacalis (Guenee) was studied. Developmental time declined substan-tially with each increase temperature between 12 to 30 oC. Constant temperatures between 10 and 14 oC or above 30 oC were detrimental to O. furnacalis. The lower theoretical threshold of development for this insect was determined to be 10.35 ± 0.02 oC. It was calculated by using the linear relationship between temperature and rate of development. The upper limit threshold tem-perature was 32oC. It was calculated by using the sigmoid model, Rt = C/ 1+ ek1 + k2T. The thermal constant required for the completion from egg to adult was 539.51 ± 8.62 degree-days.
Field investigations were in an unsprayed corn field at Yongde, Yunnan of People's Republic of China. The moths responded well to both synthetic Asian corn borer sex pheromone and the light
trap. The peak of first generation moth flight was reached on June 3. The greatest seasonal numbers of moths being trapped was on July 29. O. furnacalis overwintered mainly as larvae and produced basically three generations per year.
All stages of Asian corn borer were present throughout the study period. Distribution pat- terns of egg masses, later instar larvae, and pupae are best described by the Poison distribution. However, the spatial pattern of the early instar larvae are more closely approximated by Negative binomial distribution.
A total of 1599 individuals of arthropod fauna were caught during the tasseling stage, representing 19 species. Seven common species, Oxyopes salticus Henth, Rhopalosiphum maidis (Fitch), Coccinella seplempunctata Linn., Mythimma separata (Walker), Ostrinia furnacalis (Guenee), and Lasius alienus (Christ) comprised 89% of the total catch.
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