论文部分内容阅读
当前,华南南部早稻处于幼穗分化期,华南北部、江南和长江中游早稻及西南单季稻处于分蘖期。受近期降水偏少影响,“两迁”害虫迁入量明显偏少,稻纹枯病和稻瘟病病情轻于上年,经防治,二化螟田间虫口密度得到有效控制。据统计,全国水稻病虫害累计发生面积5644万亩次,同比减少24.2%。但下阶段华南和江南地区降雨较前期有
At present, early southern rice in southern South China is in the period of panicle differentiation. Early southern rice in southern China, southern China and the middle reaches of the Yangtze River and single-cropped rice in southwest China are at the tillering stage. Affected by the recent less rainfall, the immigrations of pests in the “two shifts” were obviously less than those in the previous year. The control rates of rice sheath blight and blast were lighter than those of the previous year. According to statistics, the cumulative area of rice diseases and pests in the country occurred 56.44 million mu, down 24.2% over the same period of last year. However, the rainfall in southern China and southern China in the next stage is higher than that in the previous period