A screwworm fly that bedeviled cattle ranchers decades ago has returned to Texas

After 148 past bullish disease events, Live Cattle moved a median +0.4% over 5 sessions (62% higher; middle half -0.5% to +1.2%), and +1.4% over 20.

• Jun 4, 2026Texas Ranchers Brace as New World Screwworm Returns to US Soil After 6 Decades+0.6%
• Jun 9, 2026Texas screwworm case drives cattle rally+0.7%
• Aug 15, 2025In Texas cattle country, ranchers brace for flesh-eating screwworms | Reuters+1.1%
• Jan 13, 2025Mexican cattle banned from Texas due to screwworm threat - The Texas Tribune+0.4%
• May 20, 2026Ranchers herd it all as fewer cattle pressure beef prices; screwworm lurks - Dallasfed.org-1.7%

After 122 past bullish disease events, Feeder Cattle moved a median +0.4% over 5 sessions (60% higher; middle half -1.0% to +1.6%), and +2.0% over 20.

• Jun 4, 2026Texas Ranchers Brace as New World Screwworm Returns to US Soil After 6 Decades+3.4%
• Jun 9, 2026Texas screwworm case drives cattle rally+3.1%
• Jan 13, 2025Mexican cattle banned from Texas due to screwworm threat - The Texas Tribune+0.4%
• May 20, 2026Ranchers herd it all as fewer cattle pressure beef prices; screwworm lurks - Dallasfed.org-4.0%
• Jun 4, 2026US screwworm case puts ranchers on alert, rallies cattle prices By Reuters+3.4%