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本文着重在前人研究的基础上,根据本地区二十九年三代粘虫资料,探讨本地区粘虫发生特点及消长规律,目的是探求预测预报方法及防治对策。三代粘虫在本地区为五年一个为害发生周期。造成周期的原因,主要是蛾主峰向后推迟所致。主峰与主峰之间,每年向后大约推移5—6天。在周期内,从蛾峰出现到蛾峰消失大约一个月(7月20日至8月20日),所以主峰最多出现五次,第一年和第二年度多为第一个蛾峰为主峰,以后随着时间推移,第二个蛾峰上升为主峰。在形成主峰前,常伴随着有一小蛾峰出现,这个小蛾峰是以后大发生的主要虫源。
Based on the previous studies, this paper focuses on the characteristics and growth of armyworm in this area based on the data of the third generation Mythimna separata (Twenty-nine generations) in the region. The purpose is to find out the forecasting methods and countermeasures. Three generations of armyworms in the region for a five-year cycle of damage occurs. Cause the cycle of the main reason is the delay postponed moth main peak. Between the main peak and the main peak, about 5-6 days backward each year. During the cycle, from the appearance of the moth peak to the disappearance of the moth peak for about one month (July 20 to August 20), the main peak appears up to five times, with the first moth peak being mostly the first and second years Later, as time went on, the second moth peak rose to the main peak. Before the formation of the main peak, often accompanied by a small moth peak appears, the small moth peak is the main source of subsequent large.