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治病为啥不如灭虫效果大在使用化学药物防治农作物病害的时候,常常会遇到这样的問題:为什么用药杀虫效果大,而用药治病就不那么見效,这是什么道理? 要了解这个問題,就需要知道原来害虫与病菌不一样,我們現在使用的杀虫药与治病的药,其作用、性质也不相同。我們知道,极大多数害虫是在植物体外进行为害活动的,一經人們发現,及时噴撒杀虫药物,如666、滴滴涕或有机磷剂1059等等,当它們沾染上了或吸食了这些药物,就会中毒而死。而为害农作物的傳染性病害,主要是由病原菌和病毒两大类寄生物浸入农作物体內而引起的。可是我們現在所使用的杀菌剂如波尔多液、石
Treatment is not as effective as disinfestation. When using chemical drugs to prevent diseases in crops, we often encounter such problems: Why do the insecticides have a great effect on the use of insecticides, and the use of drugs to treat diseases is less effective? What is the reason? In this issue, it is necessary to know that the original pests are not the same as the germs. The insecticides and the drugs that we use now have different effects and properties. We know that the vast majority of pests carry out harmful activities outside the plant. Once they are discovered, insecticides such as 666, DDT or organophosphorus agent 1059, etc. are sprayed in time when they are contaminated or taken up. , it will poison and die. Infectious diseases that damage crops are mainly caused by immersing pathogens and viruses into the crops. However, we use the bactericides such as Bordeaux fluid and stone.