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不同虫态茶银尺蠖过冷却点和结冰点的测定

Acta Phytophylacica Sinica(2022)

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Abstract
为探究茶银尺蠖Seopula subpunctaria越冬虫态及其抗寒能力,利用过冷却点测定仪测定各虫态茶银尺蠖的过冷却点和结冰点.结果表明茶银尺蠖卵的过冷却点和结冰点最低,分别为-23.21℃和-22.52℃,均显著低于其他虫态,5龄幼虫的过冷却点最高,为-5.86℃,预蛹的结冰点最高,为-1.79℃.随着幼虫龄期增加,过冷却点和结冰点逐渐升高.同虫态不同个体过冷却点和结冰点的变异均符合正态分布.雄蛹的过冷却点和结冰点分别为-11.07℃和-4.57℃,均显著低于雌蛹的-7.82℃和-2.10℃.雄成虫的过冷却点和结冰点分别-13.39℃和-7.82℃,显著低于雌成虫的-9.60℃和-3.69℃.在蛹和成虫阶段,茶银尺蠖雄性个体的抗寒能力要强于雌性个体的抗寒能力.
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