Hengyang, Hunan Province and Nanjing, Jiangsu Province) and the field overwintering test.The results showed that supercooling points of pupae were the lowest, followed by adults, eggs and larvae.

• 通过测定甜菜夜蛾三个地理种群(河北隆尧、湖南衡阳和江苏南京)的过冷却点和结冰点及田间埋蛹越冬试验，以明确甜菜夜蛾的抗寒能力。