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我省水稻白叶枯病1956年在勉县黄沙镇开始发现,1958年扩展到4000余亩.1961年传到汉中、城固,1964年发展到南郑,形成汉中地区的四个老发病县.全区1966年发病19,746亩,1969年31,887亩,1971年蔓延到了9个县,98个公社,面积58,104亩.1973年风大雨多,气候条件有利,扩大到8个县,131个公社,面积143,115亩,占全区稻田的7%左右.1972年商南农技站所采标本中,有一份系白叶枯病,1973年该站在张家岗公社地区良种场发现白叶枯病.据调查,轻病田减产1—2成,重病田5成以上.因此,积极防治白叶枯病,是生产上和科研上急待解决的问题.
Rice bacterial blight in our province began to be discovered in Huangsha Town, Mianxian County in 1956 and expanded to more than 4,000 mu in 1958. It spread to Hanzhong and Chenggu in 1961 and developed to Nanzheng in 1964, forming four old diseases in Hanzhong area The county 19,746 acres of disease in 1966, 31,887 acres in 1969, 1971 spread to nine counties, 98 communes, covering an area of 58,104 acres of wind and rain in 1973, favorable climatic conditions, expanded to 8 counties, 131 communes , Covering an area of 143,115 acres, accounting for about 7% of the paddy fields in the region.In 1972 Shangnan Nongzi station samples collected, a bacterial blight, in 1973 the station Zhangjiagang commune area found in bacterial blight According to the survey, 1-2% of light sickness crops have been cut and more than 50% of serious disease fields have been planted. Therefore, the active prevention and control of bacterial leaf blight is an urgent and urgent problem in production and scientific research.