椰心叶甲两种寄生蜂过冷却点及冰点测定

Determination of Super Cooling Points and Freezing Points of Asecodes hispinarum and Tetrastichus brontispae

椰甲截脉姬小蜂和椰扁甲啮小蜂是入侵性害虫椰心叶甲的重要天敌。为了了解这两种寄生蜂的耐寒能力,测定了椰甲截脉姬小蜂和椰扁甲啮小蜂不同发育阶段的过冷却点和冰点。从过冷却点和冰点来看,椰甲截脉姬小蜂和椰扁甲啮小蜂具有一定的耐寒能力,可在椰心叶甲发生区越冬存活。两种寄生蜂的过冷却点和冰点不同发育阶段有所不同。寄生蜂蛹的过冷却点和冰点最高。雌、雄蜂之间的过冷却点和冰点皆没有显著差异。笔者认为,椰甲截脉姬小蜂和椰扁甲啮小蜂可在中国椰心叶甲所有发生区释放应用。

Both Asecodes hispinarum and Tetrastichus brontispae are important parasitoid invasive pests of Brontispa longissima. Super cooling points and freezing points were assayed to understand the cold hardiness of these two parasitoids. The results indicated that Asecodes hispinarum and Tetrastichus brontispae had considerable high cold-resistance. They could survive in the areas where B. longissima are distributing. Both super cooling points and freezing points were different between A. hispinarum and T. brontispae. Either super cooling points or freezing points were the highest in pupae stage of these two parasitoids. However, there were no differences in super cooling points and freezing points between female and male insects. Asecodes hispinarum and Tetrastichus brontispae could be applied in the distribution areas of coconut leaf beetles in China.