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Cold Hardiness of the Overwintering Pupae of Fall Webworm Hyphantria cunea(Drury)(Lepidoptera: Arctiidae)

KONG Feng1 HAN Rui-Dong2 PEI Yuan-Hui1 LI Hong-Mei3 SUN Xu-Gen1(1College of Plant Protection,Shandong Agricultural University,Taian Shandong 271018,China;2Vocational Technical College of Weifang in Shandong Province,Shouguang Shandong 262700,China;3Shengda Landscape Company of Dongying in Shandong Province,Dongying Shandong 257000,China)  
To provide theory evidence for developing the control method of Hyphantria cunea(Drury),the supercooling point and water content of the overwinter pupae were determined at different periods.Results showed that the least supercooling point was in February(-27.07±0.38) ℃,and the highest ones was in November and March [(-20.38±2.26) ℃ and(-22.99±4.03) ℃,respectively].The highest water content was in November and December(67.03% and 65.07%,respectively).The water content started to decrease in January,reached to the lowest(30.76%) in February and increased to 45.95% in March.Change trendency of water content was similiar with that of the supercooling point.The results revealed that decreasing of water content in overwintering pupae resulted in the decrement of supercooling point,which led to enhance the ability of cold hardiness.
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