| Summary: | 碩士 === 國立嘉義大學 === 生物資源學系研究所 === 100 === The purpose of this studies were to investigate the life table of cotton aphid (Aphis gossypii Glover) fed on Lagenaria siceraria (Mol.) Standl.; Cucumis sativus L. and Cucumis melo L. at different temperatures in the laboratory. The effects of host plant transfer among taro and curcubits on the cotton aphid survival were also studied. Results had shown that the longest developmental time of different instars of nymph was fed on C. sativus. At 20oC, the developmental time of cotton aphid fed on L. siceraria, C. sativus and C. melo were 7.01, 9.09 and 8.5 days; and at 25oC the developmental time were 5.43, 6.38 and 5.92 days; and at 30oC were 4.82, 5.32 and 4.6 days. The adult longevity was shortened as the temperature increased. At 20oC, the adult longevity for aphids fed on L. siceraria, C. sativus and C. melo were 22.84, 21.6, and 22.69 days; at 25oC were 17.95, 19.03 and 18.94 days; and at 30oC were 12.54, 13.14 and 11.66 days. At 25 and 30oC, those adults fed on C. sativus had significantly longer longevity than fed on other two curcubits. The life cycle of cotton aphid fed on L. siceraria, C. sativus and C. melo at 20oC were 29.85, 30.6 and 31.2 days; at 25oC were 23.38, 25.42 and 24.87 days; and at 30oC, were 17.36, 18.46 and 16.34 days. At 20oC, aphids that fed on L. siceraria had the highest reproducetion rate (87.92 offspring/female); and at 25oC were the aphids fed on C. sativus (77.65 offspring/female), at 30oC were the aphids fed on L. siceraria (49.39 offspring/female). The highest intrinsic rate of natural increase (r) and the finite rate of increase (λ) was shown when cotton fed on L. siceraria, meanwhile, intrinsic rate of natural increase and the finite rate of increase were increased as the temperature increased for cotton aphids fed on three curcubits. At 20oC and 30oC, Net reproductive rate (R0) for cotton aphid that fed on L. siceraria were the highest; at 25oC for the aphid that fed on C. sativus was the highest. Mean generation time (T) was shorten as the temperature increased. For aphids fed on L. siceraria under 20, 25 and 30oC was shorter than those aphids that fed on other two curcubit plants (11.53, 10.95 and 8.87 days). On the study of host plants transfer among Cucurbitaceae and Colocasia esculenta, day fifth after transferring, the survival rates were lower than 10% except L. siceraria. Alate adults that fed on taro leaf transferred to five Cucurbitaceae plants and the offspring were died on day 5. At the feeding preference tests, cotton aphid from taro had shown significant preference to taro leaves, and not for the melon leaves.
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