1992年7月,我县仙稔乡等地单季稻发生黄叶病,后被浙江农业大学、温州市农科所等单位专家诊断为水稻缺素症。近年来,我县水稻缺素症发生范围迅速扩大,危害损失逐渐加剧。据1996年统计,全县发生面积达2.5万亩,占水稻种植面积20%,损失稻谷1100吨,一般发病田块 July 1992, Xianxian Township and other places single yellow rice leaf disease occurs, after being Zhejiang Agricultural University, Wenzhou City, agricultural experts and other units of experts diagnosed as rice deficiency syndrome. In recent years, the scope of rice deficiency deficiency in our county has rapidly expanded, and the damage caused by it has been gradually aggravated. According to statistics in 1996, the county occurred an area of ​​2.5 hectares, accounting for 20% of rice acreage, loss of 1100 tons of rice, the general incidence of plots