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一、杜鹃花叶肿病主要症状:嫩叶发生病害时,背面略带淡红色,肥厚肿大;嫩梢发生病害时,顶端形成瘿瘤或丛生的肥厚叶片;花被侵染时,花瓣变肥厚,呈肉质、蜡质不规则形的瘿瘤,表面有灰白色的粉状物。该病春季借气流传播,喜低温和高湿,一般在3～5月发病严重。防治方法:盆栽杜鹃移出温室后,应放在通风透光处。杜鹃萌芽前喷洒1波美度石硫合剂,
First, the main symptoms of Rhododendron dough disease: disease occurs when the young leaves, the back of a slightly reddish, hypertrophy; disease occurs when the shoots, the top of the tumor or tufted hypertrophy blade formation; perianth infection, the petal change Hypertrophic, was fleshy, waxy irregular-shaped tumor, the surface of the white powder. The disease spread by air, like low temperature and high humidity, usually in 3 to 5 months of severe disease. Prevention and treatment methods: Potted Cuckoo out of the greenhouse, should be placed in a ventilated and light place. Cuckoo sprout before spraying 1 Baume degree stone sulfur mixture,