灰茶尺蠖过冷却点和冰点的测定

The Supercooling Point and Freezing Point of Ectropis grisescens Warren

为害虫灰茶尺蠖(Ectropis grisescens Warren)的防治提供理论依据,在室内对茶尺蠖不同发育阶段的过冷却点和冰点进行了测定。结果表明:灰茶尺蠖不同发育阶段的过冷却点和冰点差异显著。其中,卵的过冷却点和冰点最低。幼虫不同发育阶段冷却点平均值由低到高依次为:一龄幼虫、二龄幼虫、三龄幼虫、预蛹、四龄幼虫、五龄幼虫,分别为-12.88℃、-12.85℃、-8.05℃、-7.12℃、-6.33℃、-6.19℃。灰茶尺蠖不同发育阶段的结冰点平均值由低到高依次是卵、一龄幼虫、二龄幼虫、三龄幼虫、预蛹、四龄幼虫、五龄幼虫、蛹,分别是-24.01℃、-11.96℃、-10.34℃、-3.17℃、-2.29℃、-2.2℃、-1.92℃、-1.84℃。卵、一龄幼虫和二龄幼虫的过冷却点和结冰点都比较低,是灰茶尺蠖理想的越冬虫态。

In this study, the variation of supercooling point (SCP) and freezing point (FP) at different stages was detected to provide theory basis for the prevention and control of Ectropis grisescens Warren. The results showed that Ectropis grisescens Warren had significant difference SCP and FP at different stages. The SCP and FP of egg were the lowest. In the different stages of larvae from low to high followed by SCP average: 1st instars, 2nd instars, 3th instars, prepupa, 4th instar larvae, 5th instars larvae, which were ?12.88?C, ?12.85?C, ?8.05?C, ?7.12?C, ?6.33?C, ?6.19?C respectively. In the different stages of Ectropis grisescens Warren from low to high followed by EP average: egg, 1st instar larvae, 2nd instar larvae, 3th instar larvae, prepupa, 4th instar larvae, 5th instars larvae, pupa, which were ?24.01?C, ?11.96?C, ?10.34?C, ?3.17?C, ?2.29?C, ?2.2?C, ?1.92?C, ?1.84?C respectively. The SCP and FP of the egg, 1st instar and 2nd instar larva are comparatively low, which is the ideal overwintering state for Ectropis grisescens Warren.