双斑长跗萤叶甲的发育起点温度与有效积温

双斑长跗萤叶甲Monolepta hieroglyphica(Motschulsky)已成为新疆北疆棉区的一重大新害虫,至今该虫各虫态的发育历期都不清楚。在室内5个恒温下(19,22,25,28和31℃),利用有效积温法则和"最小二乘法"对双斑长跗萤叶甲各虫态的发育起点温度和有效积温进行研究。结果表明,卵期、幼虫期、蛹期和产卵前期的发育起点温度分别为9.8,10.8,12.6和10.1℃;有效积温分别为1 182.2,401.2,111.9和269.0日.度;整个世代完成发育所需要的有效积温为1 971.6日.度,预测在新疆北疆1年发生1代。

Threshold temperature and effective accumulated temperature of Monolepta hieroglyphica

The leaf beetle,Monolepta hieroglyphica(Motschulsky),has become a new important pest in northern cotton planting region of Xinjiang.The developmental period of each stage had not been understood clearly.The developmental threshold temperature(C) and effective accumulative temperature(K) of M.hieroglyphica were analyzed at five constant temperatures(19,22,25,28,31℃) through effective accumulated temperature law and least square method.The result showed that the threshold temperatures of egg,larva,pupae and pre-oviposition adult were estimated to be 9.8,10.8,12.6 and 10.1℃,respectively,and the effective accumulated temperature were 1 182.2,401.2,111.9 and 269.0 degree-days,respectively.The effective accumulated temperature of one generation was 1 971.6 degree-days.It was predicted that one generation each year occurred in North of Xinjiang.