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锈病是向日葵的一种常见病。在黑龙江、吉林、辽宁、河北、江西、新疆、四川、云南、江苏、山东、湖南、河南、北京、天津、青岛、太原、西安等省市区均有发生,以沈阳和包头市发生最严重。一、症状特点该病主要危害向日葵叶片、叶柄,茎秆和葵盘等部位也可受害。被侵染的叶片于叶背面产生圆形或椭圆形的褐色小疱斑,表皮皱裂后散出褐色粉末(即病菌的一种夏孢子)。后期,病部逐渐形成黑色粉末(即病菌的冬孢子)。发病严重时叶片布满锈色斑点,使叶片提早枯黄。
Rust is a common disease of sunflower. In Heilongjiang, Jilin, Liaoning, Hebei, Jiangxi, Xinjiang, Sichuan, Yunnan, Jiangsu, Shandong, Hunan, Henan, Beijing, Tianjin, Qingdao, Taiyuan, Xi’an and other provinces and cities have occurred in Shenyang and Baotou occurred the most serious . First, the symptoms and signs The disease is the main hazard Sunflower leaves, petioles, stems and Kwai disk and other parts can also be victims. Infected leaves produce round or oval-shaped brown blister spots on the back of the leaves, which are ruptured to brownish-brown (ie, a summer spore of germs). Later, the disease gradually formed black powder (that is, the pathogen of teliospores). Serious disease when the leaves covered with rust spots, so that leaves early yellow.