幼苗和定植时的植株,最初在下叶叶背寄生,这时为害尚不严重.叶片表面,出现白碎花状症状,当叶片营养状态不良时,不断移向新叶,为害迅猛。春季的母本、秋季的幼苗及定植后的株,常有螨虫类寄生,发生量大时, 甚至寄生于新叶,导致叶片矮小、扭曲,失去生机,呈茶褐色。严重时,全株萎蔫,最后完全枯死。
你知道当它被红叶螨袭击时青豆会怎么反应吗?
You know what a Lima bean does when it's attacked by spider mites?
它释放一种挥发性成分,使之散布开来召集其他类的螨虫它们来到继而攻击红叶螨,保护青豆。
It releases this volatile chemical that goes out into the world and summons another species of mite that comes in and attacks the spider mite, defending the Lima bean.
应用推荐