美洲斑潜蝇在本市棉田的为害程度１９９７年重于１９９６年。据滑县１９９７年调查，棉花受害面积７０００ｈｍ２，受害严重地块平均虫株率７７．５％，平均虫叶率４０．８％，最高虫株率１００％，最高虫叶率６２％，部分地块严重减产，近乎绝收。美洲斑潜蝇在本地区棉花... The degree of damage of the leafminers in the cotton fields in this Municipality in 1997 was heavier in 1997 than in 1996. According to a survey conducted by Huaxian County in 1997, the area affected by cotton was 7000hm2. The average damaged rate of cotton was 77.5%, the average rate of insect was 40.8%, the highest rate of insect was 100% and the highest rate was 62%. In part, Block serious cut, almost never take. American leafminers in the region cotton ...