褐背小萤叶甲发育起点温度与有效积温研究

STUDIES OF THRESHOLD TEMPERATURE AND EFFECTIVE ACCUMULATED TEMPERATURE OF GALERUCELLA GRISESCENS

蓼科杂草是东南烟区烟田的重要为害杂草 ,对烟叶的产质量造成重大影响。田间调查表明 ,褐背小萤叶甲是蓼科杂草的重要天敌 ,对蓼科杂草具有良好的自然控制作用。本试验研究了不同温度对其生长发育的影响 ,结果表明 ,在 17- 33℃下 ,褐背小萤叶甲的发育历期随着温度的升高而减少。卵、幼虫、蛹、产卵前期的发育起点温度分别为 10 .70、12 .6 6、11.76、11.92℃ ,有效积温分别为 72 .91、14 3.80、5 3.94、5 7.4 5日度 ;整个世代的发育起点温度为 11.35℃ ,有效积温为 370 .

The weeds of Polygonaceae family are important weeds damaging tobacco in the fields in the east-south of China.They greatly affected the output and quality of tobacco leaf. The field's investigation showed the insect G. grisescens is an important natural enemy controlling the weeds of Polygonaceae . The paper dealt with the influence of temperature on the development of G. grisescens. The result showed that under constant temperature conditions in the range of 17-33℃, the duration of various stages of G. grisescens was shortened as temperature rose. Based on the results in the experiment at constant temperatures,the threshold temperature of egg, larva ,pupae , pre-oviposition and generation were estimated to be 10.70,12.66,11.76,11.92 and 11.35℃ respectively. And the effective accumulated temperature were 72.91,143.80,53.94,57.45 and 370.80 day-degrees,respectively.