浙江临海小菜蛾成虫数量季节消长规律

在浙江临海相隔60km的2个十字花科蔬菜种植区,于2002~2005年利用性诱剂诱捕器每日对小菜蛾Plutella xylostella(L.)雄成虫进行诱集并计数。对两地成虫数量季节消长与种群基数、气温、雨量和日照等因子的相关性做了统计分析,建立了5个预测模型。应用这些模型可预测全年36个旬期的雄成虫数量变化,从而可预测春季高峰期并对全年的发生量和为害程度进行预警,这对提高当地小菜蛾监测预警与综合防治水平具有实践意义。

Seasonal abundance of diamondback moth, Plutella xylostella, adults in Linhai, Zhejiang

In two localities that are 60 km apart in Linhai, Zhejiang, daily trapping and counting of male adults of the diamondback moth, Plutella xylostella(L.), were carried out for three years from 2002 to 2005. Correlation analysis was conducted between the seasonal abundance of adults trapped and the population numbers at earlier dates, temperature, rainfall and photoperiod. Five prediction models were derived. These equations can be used to predict the numbers of male adults in every ten-day period throughout the year, and predict the timing of the peak in spring as well as the abundance and level of potential damage in a year. These predictions could be improved the forewarning and management of the diamondback moth in the study region.