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菊花害虫中最可恶的是蚜虫。从幼苗到开花,它可连续不断地发生和为害,尤其是开花期,蚜虫成群钻入花瓣和花蕊吮吸花汁,会造成花瓣焦枯,使花期大大缩短。过去发生蚜虫时,我常用乐果和氧化乐果防治,这两种药在菊花苗期使用尚能收到一定的效果,但均不彻底。而如果到花期仍用它治蚜,极易造成花器药害。怎么办呢? 笔者去年试用江苏吴县生产的“一遍净”粉剂治蚜,取得了非常明显的效果。用“一遍净”治蚜有4个特点:①治蚜较彻底,用300倍液喷一次,杀蚜率可达98％以上,持效期可达30天左右;②花期用300倍液不会发生药害(应避阳光喷
Chrysanthemum pests are the most aphrodisiac aphids. From the seedlings to flowering, it can occur continuously and damage, especially in the flowering stage, aphids invade into the petals and inflorescence flower buds, will cause the petals scorched, so that the flowering period is greatly reduced. In the past aphids, I often use dimethoate and omethoate prevention and treatment of these two drugs in chrysanthemum seedlings can still receive some effect, but not completely. And if it is still used to flowering period control aphids, can easily cause flower injury. How to do? Author I tried Jiangsu Wuxian last year, “once again net” powder cure aphids, made a very significant effect. With a “net” governance aphid has four characteristics: ① governance aphid more thorough, spray with 300 times, kill aphid rate up to 98%, persistence up to 30 days; ② flowering with 300 times the liquid is not There will be phytotoxicity (should avoid the sun spray