一、为害情况我县十二万亩红薯原无薯瘟病,据调查了解,1973年6月下旬我县遭受了一次大洪水后,1974年宁州公社良塘大队黄磨生产队和赤江公社红光4队开始零星发病,由于当时未引起注意,控制不严,病区的薯种、薯苗不断外售,互相换种,以致病区日益扩大,红薯损失逐年加重。1978年全县发病公社4 First, the damage situation 120,000 acres of sweet potato in our county without the original blast, according to the investigation and understanding, in late June 1973 suffered a flood in our county, 1974 Ninglang commune Liangtang Brigade Huang mill production team and Red River commune Light 4 team began to sporadic incidence, due to the time did not pay attention to, lax control, the ward potato seedlings, potato seedlings continue to sell, change each other, resulting in the ward growing, the loss of sweet potato increased year by year. County commune in 1978 4