24 Jun Some Important Disease of Mango
आम के कुछ महत्वपूर्ण रोग 1. Powdery mildew in Mango: Oidium mangiferae (Perfect stage: Eyrsiphe polygoni) Symptoms The disease is easily recognized by whitish or grayish powdery growth on the inflorescence and tender leaves. Generally the infection starts from the inflorescence and spreads downwards covering the floral axis, tender leaves and stem. Infected leaves become twisted, curled and fall. Infected floral parts are severely damaged and drop off. If the fruits are set, they do not grow in size and may drop before attaining pea size. Fruits are sometimes malformed, discolored due to severe mildew attack. Because of poor fruits set and heavy flower and fruits drop, the loss due to the disease may be as high as 70-80%. Management Two preventive sprays with wettable sulphur 0.3% before flowers open and after fruit set. Dusting twice or thrice with fine Sulphur. Spraying with Karathane 0.1% before flowering and after fruit set (peanut stage). Resistant varieties: Neelum, Zardalu, Banglora, Torapari-khurd and Janardhan pasand. 2) Anthracnose in Mango: Colletotrichum gloeosporioides Symptoms The fungus produces leaf spots, blossom blight, wither tip, twigs blight and fruit rot On leaves circular, light yellow brown spots are produced initially which soon enlarge with dark brown to black margins. If infection is severe individual spots coalesce leading to twisting of foliage and premature defoliation The disease spreads rapidly during rainy season and covers the...