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粘虫的发生规律有些至今还没有完全弄清楚。例如越冬问题:在北纬32°、33°以北地区,尚未找到任何越冬虫态;但在北方各省早春3月初就能用糖醋液诱到大量成虫。由于每年粘虫的发生,是由南而北依次出现,有人根据室内试验认为在0℃恒温下,粘虫幼虫经10天、蛹经15天即死亡,因此就有人提出:粘虫在我国北方不能越冬,春季由南方远距离向北迁飞,秋末又迁回南方。为了证实这种说法,还先后在广东、
Some of the occurrence of armyworm has not yet been fully clarified. For example, the problem of overwintering has not found any overwintering status in the areas north of latitude 32 ° and north of 33 °. However, early spring and early March in northern provinces can induce a large number of adults with sweet and sour liquids. Because of the occurrence of armyworm in each year, it appears from south to north one by one. According to the laboratory test, some people think that at a temperature of 0 ℃, the armyworm larvae die after 10 days and the pupa will die through 15 days. Therefore, Can not wintering, the spring migrated north long distance from the south, and autumn moved back to the south. In order to confirm this view, but also in Guangdong,