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关中渭河流域的高产麦区,自1974年在周至县黑河灌区小麦品种官村1号上发现小麦土传花叶病以来,近年该病在部分麦区春季连续发生,蔓延极快。发生区域已扩大到周至、歧山、户县、长安和西安等县市,面积20余万亩,1992年在周至马召乡发病面积达10万亩。轻者可造成矮缩和穗发育不足,重者死苗、死蘖。估计一般病田可减产一至二成,重病田块还发生过毁苗改种的情况。户县余下一块2亩的麦田,由于该病危
Guanzhong Weihe River high-yielding wheat area, since 1974 Zhou Heihe Heihe Irrigation District, the number of wheat varieties found in the village of Mosaic on the soil mosaic disease in recent years in some areas of wheat continuous occurrence of spring, spread very fast. The occurrence of the area has been extended to Zhouzhi, Qishan, Huxian, Chang’an and Xi’an and other counties and cities, covering an area of more than 20 acres, 1992 Zhouzhao Mazhao Township incidence of up to 10 acres. Light can cause dwarf and spike development, severe dead seedlings, dead tillers. It is estimated that general disease can be reduced from one to two into a disease, serious disease also occurred in the field of seedlings changed seedlings. Huxian the remaining 2 acres of wheat fields, due to the critically ill