湖北省钟祥市粘虫发生规律研究

为了明确粘虫Mythimna separata(Walker)在湖北省钟祥市的发生规律,对小麦玉米轮作田粘虫成虫和幼虫种群的发生动态、粘虫雌蛾卵巢发育进度以及粘虫越冬虫量作了调查,分析了粘虫种群虫源性质。结果表明,钟祥市为1代粘虫多发区,其虫源为外地迁入的越冬代成虫,1代粘虫危害高峰期在4月中下旬,羽化盛期在5月中下旬,羽化后以迁出为主。第2代粘虫发生量很小,羽化后基本全部迁出;在田间未调查到第3代粘虫幼虫,本区发现的第3代成虫可能为由北方南迁的过境种群;第4代粘虫发生量也很小,羽化后全部迁出,不在本区繁殖危害。在田间未调查到准备越冬的粘虫。

The research of occurrence regularity of Mythimna separata (Walker) in Zhongxiang city of Hubei Province

To make clear the occurrence regularity of armyworm,Mythimna separata (Walker) in Zhongxiang city, Hubei Province, the occurrence dynamics of adults and larvae, grade of ovary of female moth and overwintering number of armyworm were investigated, at the same time analyzed the type of migrant population. The results showed that the occurrence amount of the first generation is maximum, adults of overwintering generation that immigrate from other places to Zhongxiang are the pest source. The damage peak period of the first generation is mid-late April and the peak period of eclosion is mid-late May, then mainly emigrate to other places. The occurrence amount of the second generation is small, almost all of adults of this generation emigrate to other places. Larva of the third generation was not found in the farmland, adults of this generation probably belong to a transit population. The occurrence amount of the fourth generation is small, almost all of adults of this generation emigrate to other places too. Overwintering larva or pupa was not found in the farmland.