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干腐病是马铃薯种薯贮藏期间最为常见的真菌性病害之一,其常年发病率10～30%左右,对种薯的安全贮藏威胁很大。此外,种植带菌的种薯不仅影响来年的产量,而且还会污染土壤,增加土壤中病原体的数量。 1.症状块茎表面初呈褐色病斑,以后病斑逐渐扩大呈深褐色,边缘不明显。随着块茎失水率的增加,病部表面呈环状皱缩,深层病部组织浅褐色,有时具深色条纹,严重时有空腔形成,空腔内长满灰白色菌丝。发病后期,病斑表面常产生白色或粉红色的霉层,块茎僵缩,一捏即成粉状。
Dry rot is one of the most common fungal diseases during potato seed storage. Its annual incidence is about 10% to 30%, which poses a great threat to the safe storage of seed potatoes. In addition, planting contaminated seed potatoes not only affects the production of the coming year, but also pollutes the soil and increases the number of pathogens in the soil. 1. Symptoms tuberous brown lesions at the beginning of the surface, the lesion gradually expanded dark brown, the edge is not obvious. With the increase of water loss rate of tubercle, the surface of the diseased part showed annular shrinkage. The dark part of the diseased part was light brown in color, sometimes with dark streaks and cavities in severe cases. Late onset, lesions often produce white or pink mildew, tuber stiffening, pinch that is powdery.