Comparative demography of Liriomyza sativae Blanchard (Diptera: Agromyzidae) on cucumber at seven constant temperatures

摘要

Reproduction and population parameters of vegetable leafminer, Liriomyza sativae Blanchard were measured on cucumber (Cucumis sativus L.) at seven constant temperatures (10,15, 20, 25, 30, 35 and 40℃). No eggs were found at 10℃ and flies died after exposure to 40℃. The significantly highest intrinsic rate of natural increase (r_m), net reproductive rate (R_0) and finite rate of increase (A) of L. sativae were obtained at 25℃ as 0.196, 52.452, and 1.216, respectively. The above-mentioned parameters decreased at 15℃ and 35℃ and this reduction at 35℃ was strong. Doubling time (DT) varied significantly with temperature. The shortest doubling time was obtained at 25℃. Mean generation time (T) decreased significantly with increasing temperature between 15℃ and 35℃. Percentage of immature ages in the stable age distribution was more than 95% at all temperatures. Female longevity was greater than male at all temperatures. Liriomyza sativae lived for a long time at 15℃, whereas at 35℃ had lower survival rates. The effect of temperature on reproduction, especially the intrinsic rate of increase of L. sativae would be useful for predicting its long-term population fluctuation over several generations.