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A South Texas ranch and a regional rancher warn that the New World screwworm, a fly that burrows into open wounds of warm-blooded animals, is spreading north through Mexico. Representative Monica De La Cruz proposed legislation asking the USDA to study the threat and prepare a response.
Local ranchers are deworming herds and are most worried about calf losses if the pest crosses the border.
A screwworm incursion into US cattle country would threaten calf crops and herd health, tightening the already tight feeder and live cattle supply. Continued border restrictions on Mexican cattle would also keep supply constrained, which supports cattle prices.
krgv.comChristian Von PreysingNov 2, 2026After 148 past bullish disease events, LCATTLE moved a median +0.4% over 5 sessions (62% higher; middle half -0.5% to +1.2%), and +1.4% over 20.
After 122 past bullish disease events, FCATTLE moved a median +0.4% over 5 sessions (60% higher; middle half -1.0% to +1.6%), and +2.0% over 20.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.
