温度对尖锥额野螟幼虫取食量的影响

为探讨温度对尖锥额野螟幼虫取食危害规律的影响，在17、21、25、29、33℃条件下，对其各龄幼虫的取食量和取食速率进行测定。结果显示，在试验温度条件下幼虫的取食量随着龄期的增大而增加，同一龄期幼虫在不同温度下取食量存在差异。幼虫期总取食量以25℃最多，为4806.85 mm²，21、29和33℃较低，17℃时最低仅为3888.53 mm²。随着龄期的增大尖锥额野螟各龄幼虫的取食量成倍增长，不同温度下，尖锥额野螟幼虫各龄期的累积取食量变化均符合指数函数曲线。各龄幼虫取食速率与温度和龄期成正比，5龄幼虫取食速率最大，同龄期幼虫各温度间取食速率差异均较为显著。因此，在预测尖锥额野螟幼虫田间防治适期时，还应充分考虑环境温度等气候因素。

Effects of Temperature on the Feeding Amount of Sitochroa verticalis (L.) Larvae

In order to research the effects of temperature on feeding habits of Sitochroa verticalis larvae, the feeding amount and feeding rate of each instar larvae were studied at five constant temperatures （17, 21, 25, 29, 33℃） in an artificial climate box. The results showed that the feeding amount was gradually increasing with the growth of the larvae, and it was different at different temperatures in the same instar. The maximum feeding amount of larvae was 4806.85 mm2 at 25℃. Less appropriate temperature was 21, 29 and 33℃, and 17℃ was the least appropriate temperature with feeding amount of 3888.53 mm2. Larval cumulative feeding amount obviously increased with the growth of larvae and the rising of temperature and fit exponential function curve. The larval feeding amounts were proportional to temperature and the growth of larvae. There were significant difference in the feeding rate of the same instars larvae at different temperature, and the maximum feeding rate was at the 5th instar. Therefore, Sitochroa verticalis forecasting and controlling in field must take into consideration some climate factors such as environmental temperature and others.