关键词: 美洲斑潜蝇, 温度, 生命表, 种群参数

Abstract: The development duration, survival rate, fecundity and longevity of the vegetable leafminer Liriomyza sativae Blanchard were observed at 15℃, 20℃, 25℃, 30℃ and 35℃ with RH76%. The results showed that duration of its various stages was shortened as temperature rose. The development durations of egg, larva and pupa varied from 7.6 to 2.0, 12.7 to 2.9 and 34.3 to 6.8 days, respectively. The average longevity of adults ranged from 17.3 days to 6.5 days. The development temperature thresholds for egg, larva and pupa were 7.5, 9.8, 11.5 and 10.9℃ with effective accumulated temperatures of 53.9, 52.7, 128.5 and 229.9(egg to pupa) day-degree, respectively. The survival rates of eggs were more than 84.2% under all temperatures tested, and those of larvae were above 94.5% except 66.7% at 15℃. Pupal survival rate varied greatly with the maximum 80.3% at 25℃ and the minimum 10.0% at 35℃. Since no egg was laid by the adults at 15℃, reproduction-specific life tables were constructed under the other four temperatures, which indicated that the maximum innate capacity of increase (r_m), the shortest doubling time (t), and the highest net reproduction rate (R₀) of the experimental population at occurred 30℃. Percentages of immature stage in the stable age-distribution were more than 97% at all temperatures tested.

Key words: Liriomyza sativae, temperature, life table, population parameter