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从来信中所说的“番茄苗长到20～30厘米以后,出现叶片枯萎、下垂、脱水而死.而且,茎部腐烂变黑”等症状来看,应可定为番茄青枯病.此病在本省发生普遍且严重.现特将其症状特点、产生原因及防治方法介绍以下,请再对照实际情况,如无大出入,可试以此病进行防治.番茄青枯病在苗期不表现症状,植株长到1尺多高后才开始发病.首先是顶部叶片萎垂,而后下部叶片凋萎,最后中部叶片方凋萎.病株白天萎蔫,傍晚
The letter from the letter said, “tomato seedlings grow to 20 to 30 cm later, the leaves withered, drooping, dehydration and death. And stem rot black” and other symptoms, should be identified as tomato bacterial wilt. The prevalence of disease in the province is widespread and serious .Special symptoms, causes and prevention methods are introduced below, please control the actual situation, if not out of reach, you can try to control the disease. First, the top leaves withered, then the lower leaves withered, and finally withered withered leaves in the middle. The diseased plants wilted during the day and evening