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番茄早疫病(轮纹病),在南方大部分菜区及北方的一些菜区为害较重。番茄在整个生育期间都可罹患此病,发病重时可引起叶片枯死、茎杆折断,果实脱落,降低产量,品质变坏,对生产威胁很大。今年春季气候异常,气温变化大,部分地区雨水偏多,因而番茄早疫病在秧苗期及保护地内就普遍发生。据预测,今年露地番茄早疫病在大部分番茄种植区将偏重流行。为了做好防治工作,现将此病的发生规律及测报和防治的方法简介于下。一、为害症状早疫病不仅为害叶片,还侵害茎和果实。叶片受害,初生暗褐色水渍状小斑点,然后逐渐扩大成近圆形或椭圆形病斑,灰褐色,中间有暗褐色同心轮纹。发病重时,病斑相互连结成块,病叶枯焦和脱落。
Early blight (Rotavirus) in tomatoes is more damaging in most vegetable areas in the South and some vegetable areas in the North. Tomatoes can suffer from this disease during the whole growth period. Occurrence of severe diseases can cause the leaves to die, the stems break, the fruit fall off, the output is reduced, the quality is deteriorated, and the production is very threatening. This spring anomalous climate, temperature changes, rainfall in some areas is too much, so tomato early blight in the seedling and protected areas on the common occurrence. It is predicted that this year, early blight of Tomato Tomatoes will be prevalent in most tomato growing areas. In order to do a good job of prevention and treatment, now the incidence of this disease and the method of reporting and prevention and treatment is summarized below. First, the symptoms of damage Early blight not only damage leaves, but also against stems and fruits. Blades victim, primary dark brown water-like small spots, and then gradually expanded into nearly circular or oval lesions, taupe, the middle dark brown concentric pattern. Occurrence of severe disease, spots linked to each other into pieces, sick leaves Kujiao and fall off.