浙南地区甜菜夜蛾发生规律与测报技术

通过4年研究,明确了甜菜夜蛾在浙南地区大田一年发生5~6代,第6代为不完全代,越冬蛹在设施栽培蔬菜地越冬。4月下旬~5月初陆续羽化,6月上旬~7月上旬为大田第1代,7月上旬~8月上旬为大田第2代,8月上旬~8月底为大田第3代,9月初~9月下旬为大田第4代,10月初~10月下旬为大田第5代,11月上旬~翌年4月下旬为大田第6代,为不完全代。一年中在6月中下旬7、月中下旬、8月中旬、9月中旬有明显发蛾高峰。研究还明确了甜菜夜蛾不同世代不同虫态的发育历期,并利用历期法对甜菜夜蛾发生期进行预测,利用黑光灯发蛾量对甜菜夜蛾的发生程度进行预测预报。

The occurrence and forecasting technique of beet armyworm,Spodoptera exigua in the South of Zhejiang province

The results of four-year study showed that beet armyworm,Spodoptera exigua had 5 or 6 generations in Southern Zhejiang Province each year. The 6th generation was often incomplete,and its pupae livesthrough the winter in protected cultivation field.The emergence period of S.exigua adults appeared from the third ten days of April to early May,the 1st generation occurred from the first ten days of June to the first ten days of July,the 2nd generation from the first ten days of July to early August,the 3rd generation in August,the 4th generation in September,the 5th generation in October,the 6th generation appeared from the first ten days of November to April of next year.There were four distinct adult peaks appeared in the second ten days of June,the third ten days of July,the second ten days of August,and the second ten days of September,respectively.The development duration of different generations were studied,and used for predicting and forecasting the occurrence of S.exigua.