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大白菜病毒病,又称孤丁病,全国各地均有发生,华北、东北地区受害尤重。大白菜苗期受害,心叶产生明脉褪绿,继而呈花叶,皱缩,扭曲;成株期病株矮缩,有时叶片上密集黑褐色小斑,叶球不耐贮藏,严重病株不能结球;带病的留种株,严重的抽薹前枯死,轻病株抽薹晚,薹短而弯曲,叶片小而硬,明脉,花叶,花梗上有纵横裂口,果荚瘦小,种子发芽率低。其防治技术: 1.选抗病品种大白菜的抗病品种有北京新1号、北京大青口、山东1号、天津绿、小杂56、冀3号、青杂5号、晋菜1号、抱头青等。 2.隔蚜育苗大白菜有直播和育苗移栽两种育苗方式。对于育苗移栽,应尽量避开栽种十字花科作物的地块,并重新整地作畦。 3.冷纱覆盖育苗育苗的畦块,播种
Chinese cabbage virus disease, also known as solitary disease, have occurred throughout the country, North China and Northeast China suffered particularly heavy. The seedlings of Chinese cabbage were harmed at the seedling stage, and the heart leaves developed meiaming chlorosis, followed by mosaic, shrinkage and twisting. The adult plants dwarfed, sometimes with dark brown spots on the leaves, Unable to catch the ball; sick leave the strain, severe bolting before death, light plant late bolting, sedge short and curved, small and hard leaves, Ming veins, mosaic, vertical and horizontal cracks on the pedicle, pod thin, seeds Germination rate is low. The prevention and treatment technology: 1. Select disease-resistant varieties of Chinese cabbage resistant varieties are Beijing New 1, Beijing Daqingkou, Shandong 1, Tianjin Green, a small hybrid 56, Hebei 3, Green hybrid 5, Jin 1 Number, Baotouqing and so on. 2. Every aphid nursery cabbage live and nursery transplanting two nursery methods. For transplanting seedlings, should try to avoid the planting of cruciferous crops plots, and re-soil preparation for flesh. 3. Cold yarn nursery nursery stock block cover, sowing