有位菜农朋友电话咨询他在“有病早治,无病早防”的格言指导下对温室生病的黄瓜用药防治了几次,结果不但没有治好,病情反而越来越重。怀疑是否用了“水货”农药,要不怎会落个“劳民伤财”?笔者赶到现场一看:病株顶尖生长点萎缩,中部叶缘发黄。这是因缺水而引发的非侵染性病态, A friend of vegetable friends to consult him in the “ill early treatment, disease prevention and early warning,” the motto under the guidance of cucumber greenhouse disease prevention and treatment of several times, the result is not only not cured, the condition is getting heavier and heavier. Doubt whether the use of “parallel” pesticides, or how will fall a “waste of money”? I rushed to the scene to see: the top of the disease point growth atrophy, yellow leaves central edge. This is due to lack of water caused by non-invasive pathological,