花椒窄吉丁发生期气象条件分析

为了掌握气象条件对花椒窄吉丁发生期、危害程度的影响,运用2005—2009年花椒窄吉丁虫害资料与同期气象资料统计分析得出:温度和湿度是影响窄吉丁不同生育期的主要因子,春季气温回升早、秋季降温迟有利于延长幼虫活动期。高温、少雨、干燥的天气有利于窄吉丁的发生和扩散,危害程度加重。反之,低温、多雨、湿润的天气不利于窄吉丁的活动和发展,危害减轻。4—8月降水偏多的年份虫害轻;夏季干旱少雨时虫害会大面积发生。5—6月高温天气、强降水对成虫羽化、卵孵化不利,影响害虫的迁徙和繁殖。用积温法对成虫始见期、卵孵化期进行预测,为虫害防治提供最佳时机。

Analysis on Climate Condition during Occurrence Period of Agrilu s zanthoxylumi

In order to understand the effect of climate condition on occurrence period and damage degree of A grilus zanthoxylumi,statistical analysis was carried on using the Agrilua zanthoxylum data and climate data from 2005 to 2009. The result showed that temperature and moisture were main factors influencing the growth periods ofAgrilus zanthoxylumi. Early temperature increasing in spring and late temperature decreasing in autumn may prolong the larva active period. The high temperature,less rainfall and drying were beneficial to occurrence and pervasion of A grilus zonthoxylumi, and increase the damage;conversely,low temperature, more rainfall and wetness were against the activity and occurrence of A grilus zanthoxylumi, and decrease the damage. The damage caused by Agrilus zanthoxylumi was lighter in the years which had more rainfalls during April to August. High temperature and strong rainfall during May to june were against the emergence and incubation, influencing the migration and breeding. Cumulative temperature method was employed to forecast the beginning occurrence stage and incubation stage ,so as to determine the best eontrol time of A grilus zanthoxylumi.