达县分葱田甜菜夜蛾发生规律初步研究

Preliminary study on the occurring rules of Spodoptera exigua in bunching onion fields in Da county

采用系统调查方法研究了达县地区分葱田甜菜夜蛾的生活史、发生与环境的关系。甜菜夜蛾在达县分葱田1a发生6代,以三至五代为害最重,世代重叠。其数量消长与虫源、夏秋季气候、天敌、栽培管理等因素密切相关。通过调查分析提出本县初始虫源非本地虫源。

Using the systemic investigation methods, it was demonstrated tha t there were six generations of Spodopteraexigua and overlapping phenomenon in a year in bunching onion fields in Da count y, most heaviest losses were caused by the third, the fourth and the fifth gener ations. The moth amount was closely related to pest sources, summer and autumn c limates, natural enemies and planting managements. It was also put forward that the initial sources of Spodoptera exigua emigrated from other area.