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1998年小麦叶枯病在衡水市区大发生流行,病发面积1625hm~2,占小麦种植面积的87.4％;总损失小麦达19348t,发病面积之大,损失之重为历年罕见。1 发病特点1.1 发生早、蔓延长 据调查,4月20日前后,衡水市区小麦大部抽齐穗,比历年抽穗期提前10～15天。此期小麦叶枯病症状明显,比历年早15天左右。5月上旬、全市区87％以上的麦田病发流行。
In 1998, wheat leaf blight was prevalent in Hengshui urban area, with an area of 1625 hm 2, accounting for 87.4% of the total area planted with wheat. The total loss of wheat was 19348 tons and its area of disease was large. The weight loss was rare over the years. 1 Morphological characteristics 1.1 Early, spread According to the survey, around April 20, most of the wheat in Hengshui district raspberry, heading 10 to 15 days earlier than the calendar year. The symptoms of wheat leaf blight in this period are obvious, about 15 days earlier than the calendar year. In early May, more than 87% of the wheat fields in the urban area were endemic.