卵形异绒螨卵的发育起点温度测定

Determination on the developmental threshold temperature of egg of Allothrombium ovatum

通过室内 5种恒温和自然变温对卵形异绒螨卵的发育起点温度测定 ,结果表明 ,卵形异绒螨卵的发育历期随着环境温度的升高而缩短 ;发育起点温度恒温处理下为(8.797± 0 .750 )℃ ,自然变温处理下为 (6.1 49± 2 .986)℃ ;利用王如松模型计算最低临界发育温度为 1 0 .351℃。与麦蚜各龄期比较 ,认为该螨发育起点温度高于麦蚜 ,因之在发生时间上已错过了对麦蚜有利的控制时期。

Developmental threshold temperature of egg Allothrombium ovatum was determined in five constant temperatures and natural temperatures in laboratory.The results showed that the development periods of the mite egg decreased as the environmental temperatures raised.In constant temperatures and natural temperatures,the developmental threshold temperature of the mite egg were (8.797±0.750) ℃ and ( 6.149±2.986) ℃,respectively.However,the threshold temperature according to Wangs simulation model in natural temperatures is 10.351 ℃.The temperature of the mite egg is highter than that of wheat aphids when both temperatures are compared.Thus,the mite missed controlling periods on wheat aphids in time.