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美洲斑潜蝇ＬｉｒｉｏｍｙｚａｓａｔｉｖａｅＢｌａｎｃｈａｒｄ是危险性害虫。经普查和研究，该虫从１９９４年秋季在古田发现以来，仅１年多就蔓延全县所有乡镇和海拔１１００米以下各梯级高程山区。其中城关及交通要道附近的乡村发生危害比边远地区严重；低海拔平原地区比高海拔山区严重。危害对象达９个科３０种植物。其中瓜类和豆类发生危害较严重；偏施化肥的作物比施农家肥的严重。药剂防治效果最佳的是功夫和氯氰菊酯，杀虫率可达９５％以上；其次是乐果，杀虫率９１％，但有效期比功夫和菊酯长。
Liriomyzasativae Blanchard is a dangerous pest. After the census and the investigation, the pest was found in Gutian in the fall of 1994, and it spread to all the townships in the county and the mountainous areas with various steps below 1100 meters above sea level in just over a year. Among them, the hazards in villages near Chengguan Pass and traffic thoroughfare are more serious than those in remote areas; the low-altitude plain area is more serious than the high-altitude mountain area. Hazardous objects up to 9 families and 30 species of plants. Among them, melons and legumes are harmed more seriously. Crops with partial fertilizer are more serious than those with farmer manure. Pharmacy is the best control effect of kung fu and cypermethrin, insecticidal rate of up to 95%; followed by dimethoate, insecticidal rate of 91%, but the effective period of kung fu and pyrethrum long.