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红薯根腐病是七十年代初期流行起来的一种毁灭性病害,我省开封、许昌、洛阳、南阳、周口等地区的许多县社普遍发生严重,一般减产三、四成,重病田甚至绝收,已成为我省红薯生产中的严重障碍。面对这种新病害的出现,各地在作防治试验时,曾试用过多种杀菌剂,但多数效果不明显,至今仍然提不出一种可供应用的化学农药来。近年来,我们在观察红薯根腐病发病规律时
The root rot disease of sweet potato is a devastating disease prevalent in the early seventies. Many provinces and counties in Xuchang, Luoyang, Nanyang and Zhoukou areas of Kaifeng province of our province have suffered from serious diseases, with the general reduction of production by 40% to 40% , Has become a serious obstacle in the production of sweet potato in our province. In the face of the emergence of this new disease, many kinds of fungicides have been tried all over the country for prevention and treatment tests, but most of the results have not been obvious. So far, no chemical pesticide has been available for application. In recent years, we observe the incidence of sweet potato root rot disease