中文摘要：

【目的】探讨取食不同寄主植物对二点委夜蛾Athetis lepigone（Mschler）老熟幼虫抗寒性的影响。【方法】室内分别用棉花、花生、大豆、甘薯及玉米的幼嫩叶片饲养二点委夜蛾4龄幼虫6 d至老熟,测定二点委夜蛾老熟幼虫过冷却点、结冰点、鲜重、含水量、脂肪、糖原和山梨醇含量。【结果】二点委夜蛾老熟幼虫取食不同寄主植物叶片后结冰点、鲜重、脂肪含量、糖原含量有显著差异。取食大豆叶片后结冰点最高（-2.80℃）,鲜重最低（0.056 g）,脂肪含量最低（12.47%）;取食棉花叶片后结冰点最低（-5.45℃）,脂肪含量最高（32.12%）,糖原含量最高（54.07 mg/g）;取食玉米叶片后鲜重最高（0.118 g）。取食不同寄主植物叶片的二点委夜蛾老熟幼虫过冷却点、含水量、山梨醇含量没有显著差异。【结论】寄主植物对二点委夜蛾老熟幼虫过冷却点没有显著影响,而影响到其体重及脂肪和糖原含量。

英文摘要：

【Aim】This study aims to assess the influence of host plants on the cold hardiness of Athetis lepigone mature larvae. 【Methods】The 4th instar larvae of A. lepigone were fed with leaves of cotton,peanut,soybean,sweet potato and maize,respectively,for 6 d to maturity. The supercooling point,freezing point,fresh body weight,water content,and fat,glycogen and sorbitol contents of A. lepigone mature larvae were measured. 【Results】The freezing point,fresh body weight,and the contents of fat and glycogen significantly differed among mature larvae of A. lepigone fed with leaves of different host plants. The larvae fed with soybean leaves had the highest freezing point（-2. 80℃） and the lowest fresh weight（ 0. 056 g） and fat content（ 12. 47%）. The larvae fed with cotton leaves had the lowest freezing point（-5. 45℃）,and the highest fat（ 32. 12%） and glycogen contents（ 54. 07 mg / g）. The fresh body weight of larvae fed with maize leaves was the highest（ 0. 118 g）. There were no significant differences in the supercooling point,water content and sorbitol content among mature larvae fed with different plant leaves. 【Conclusion】The host plants have no significant influence on the supercooling point of mature larvae of A. lepigone,but have significant influence on their fresh body weight and fat and glycogen contents.