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据Shipton等报道,1898年小麦颖枯病在美国马里兰州的Townsend首次发现,并引起了43-50%的产量损失.本世纪初该病对小麦产量的损失估计为10%(马里兰州)到5%(北卡罗来纳州),最近却达到31-50%.虽然降雨少的年份,产量损失微不足道,但颖枯病确已成为限制美国东南部小麦产量的主要因素.
According to Shipton et al., WP was first found in Townsend, Maryland, in 1898 and caused 43-50% of the yield loss at the beginning of this century, estimated to be 10% (Maryland) to wheat yield 5% (North Carolina), and recently reached 31-50% .While rainfall is negligible in years of low rainfall, locust infection has been a major factor limiting wheat production in the southeastern United States.