编辑同志:去年,我利用地膜覆盖方法栽培了1亩小辣椒和4亩大青椒。苗期茁壮,定植至初花期长势喜人,此时,我为了预防青椒“三落病”的发生,叶面喷施双效灵农药。同时,为了防治甘蓝夜盗虫又喷了溴氰菌酯(敌杀死)农药。药后3天发现植株由翠绿色变为墨绿色,并基本停止生长。药后第7天,植株中下部叶片出现圆形或不规则形褐色病斑,并向上卷曲,直至变黄脱落,最后又导致落花落果。上述病害的原因至今未查清,特请教我的老师《新农业》。昌图县牤牛哨乡新农村.徐强忠徐强忠同志:新农业转来了你的来信,根据你信中所说的情况,初步认为是药害所致。其原因有三:①人们所说的辣椒“三落”,是病毒病所致。你在喷药前,未见病毒病发生,或极少见。只为预防喷药,一般不可能在短短几天 Editor’s Comrade: Last year, I cultivated 1 mu of peppers and 4 mu of green peppers by using plastic film mulching. At the seedling stage, the planting is good to the first flowering stage. At this moment, in order to prevent the occurrence of “three down diseases” of green peppers, I spray double-effect pesticide on the foliage. At the same time, in order to control cabbage night piranha sprayed with cyanogen bromide ester (enemy kill) pesticides. Three days after treatment, the plants were found to change from emerald green to dark green, and the growth was stopped. On the 7th day after treatment, round or irregular brown spots appeared on the lower leaves of the plants and were curled upwards until they turned yellow and fall off, which eventually led to the drop of fruit. The cause of the disease has not yet identified, especially ask my teacher “new agriculture.” Comrades Xu Qiangzhong Xu Qiangzhong: New Agriculture transferred your letter, according to what you said in your letter, initially believed to be caused by drug damage. There are three reasons for this: (1) What people call “peppers” is caused by virus disease. You have not seen the virus disease before spraying or rare. Only for the prevention of spraying, it is generally impossible in just a few days