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1993年德州、宁津、夏津、陵县、庆云、武城、平原七县(市)的套种玉米发生了史无前例的玉米粗缩病 Maize Rough dwarf Virus。被害株显著矮化,仅有健株的1/3—1/4,茎节粗而短,叶子挺直,叶片浓绿而厚,顺叶脉有间隔的半透明状条斑,叶背叶脉微突起。发病株多数不能抽穗。据调查,4月下旬前播种的春玉米和麦收后播种的玉米极少发病;5月下旬播种的套种玉米和晚春玉米发病最重,一般病株率20—40%,严重地块达87%,减产50%以上,
In 1993 Maize Rough dwarf Virus (Maize Rough dwarf Virus), an unprecedented corn maize disease occurred in intercropped maize in Texas, Ningjin, Xiajin, Lingxian, Qingyun, Wucheng and Pingyuan counties. The diseased plants were significantly dwarfed, with only 1/3 to 1/4 of the healthy plants. The stems were thick and short, the leaves were straight, the leaves were thick green and thick, with semitranslucent streaks along the veins, Prominent. The majority of diseased plants can not be heading. According to the survey, spring maize and wheat sown before late April were seldom morbidly sown; the intercropping maize and late spring maize sown most severely in late May, with the average rate of diseased plants being 20-40% and the serious land reaching 87% , Cut more than 50%