2026年7月29日 21:30 UTC / 路透社
作者：汤姆·波兰塞克
2026年6月22日，美国得克萨斯州奥佐纳以南的两个得州县又有三头牲畜检测出新大陆螺旋蝇阳性，美国确诊病例升至15例。图为在得克萨斯州163号州道旁的牧场中漫步的牛群。新大陆螺旋蝇是一种会将温血动物活活啃食的寄生蝇。路透社/乔尔·安赫尔·华雷斯/资料图片 购买授权，将在新标签页打开
芝加哥7月29日路透电——美国农业部周三表示，将斥资2500万美元在亚利桑那州建设一座设施，用于投放不育蝇，以对抗食肉性牲畜害虫新大陆螺旋蝇。
该设施将扩大美国政府控制螺旋蝇扩散的工作力度，此前美国农业部计划取消一年多前为阻止该害虫进入美国而实施的墨西哥牛肉进口禁令。
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对墨西哥牛肉的进口禁令曾推动美国牛肉价格创下历史新高，损害了消费者利益，并给唐纳德·特朗普政府带来了降价压力。不过，恢复进口的决定遭到了一些美国养牛户的批评，他们认为这会增加螺旋蝇感染的风险。
美国农业部表示，对抗螺旋蝇最有效的手段就是不育蝇。根据X平台上的一则帖子，亚利桑那州州长凯蒂·霍布斯周三曾致信该机构，提议在亚利桑那州道格拉斯市建设一座不育蝇投放设施。
美国农业部周五表示，计划于8月24日在道格拉斯的一个入境口岸恢复进口墨西哥牛肉，随后将在新墨西哥州开放另外两个入境口岸。
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霍布斯表示：“新大陆螺旋蝇的持续威胁、牲畜贸易的长期中断以及养殖户面临的额外成本，可能会推高牛肉价格，进一步加剧家庭食品预算的压力。”
螺旋蝇是一种寄生蝇，雌蝇会将卵产在任何温血动物的开放性伤口和黏膜上。卵孵化后，数百只螺旋蝇幼虫会用锋利的口器钻入活组织中，如果不及时治疗，最终会导致宿主死亡。
这种害虫已经从中美洲向北扩散，6月份在得克萨斯州的农场和新墨西哥州被发现。
美国农业部表示，需要投放更多的不育蝇，才能将这种害虫击退到达连隘口的地理边界——巴拿马和哥伦比亚之间的热带雨林地带。该机构正在得克萨斯州建设一座价值7.5亿美元的不育蝇生产工厂。
blob:https://www.reuters.com/1e7479a5-c19f-48a2-b57c-b8b234cbe712
汤姆·波兰塞克在芝加哥报道；莉亚·道格拉斯在华盛顿补充报道；比尔·伯克罗特编辑
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USDA to fund Arizona facility to fight flesh-eating livestock pest
July 29, 2026 9:30 PM UTC / Reuters
By Tom Polansek
Cattle roam a field adjacent to Texas State Highway 163 after the confirmed number of U.S. cases of New World screwworm, a parasitic fly that eats warm-blooded animals alive, rose to 15 after three more animals tested positive in two Texas counties, south of Ozona, Texas, U.S. June 22, 2026. REUTERS/Joel Angel Juarez/File Photo Purchase Licensing Rights, opens new tab
CHICAGO, July 29 (Reuters) – The U.S. Department of Agriculture will spend $25 million on a facility in Arizona to disperse sterile flies used to combat the flesh-eating livestock pest New World screwworm, the agency said on Wednesday.
The facility will expand Washington’s efforts to control the spread of screwworms as the USDA plans to lift a ban on imports of Mexican cattle that it imposed more than a year ago in an attempt to keep the pest out of the U.S.
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The ban on Mexican cattle helped push U.S. beef prices to record highs, hurting consumers and putting pressure on Donald Trump’s administration to lower costs. However, the decision to resume imports drew criticism from some U.S. cattle producers, who said it would increase the risk for screwworm infestations.
The most effective tool against screwworm is sterile flies, according to the USDA. Arizona Governor Katie Hobbs sent a letter to the agency on Wednesday that proposed a dispersal facility for them in Douglas, Arizona, according to a post on X.
The USDA said on Friday that it planned to resume importing Mexican cattle at a port of entry in Douglas on August 24, and then eventually open two additional ports of entry in New Mexico.
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“The continued threat of New World screwworm, prolonged disruptions to livestock trade, and additional costs for producers could keep beef prices elevated and further strain household grocery budgets,” Hobbs said.
Screwworms are parasitic flies whose females lay eggs in open wounds and mucous membranes on any warm-blooded animal. Once the eggs hatch, hundreds of screwworm larvae use their sharp mouths to burrow through living flesh, eventually killing their host if left untreated.
The pest has moved north through Central America and was detected in June on Texas farms and in New Mexico.
The USDA has said it needs many more sterile flies to push the pest back to the geographic boundary of the Darien Gap, the stretch of rainforest between Panama and Colombia. The agency is constructing a $750 million production plant for sterile flies in Texas.
blob:https://www.reuters.com/1e7479a5-c19f-48a2-b57c-b8b234cbe712
Reporting by Tom Polansek in Chicago; Additional reporting by Leah Douglas in Washington; Editing by Bill Berkrot
Our Standards: The Thomson Reuters Trust Principles.
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