June 8, 2026 | Podcast
The New World screwworm is no longer a theoretical risk. It has been confirmed in Texas.
In early June 2026, a case was identified in a calf in Zavala County, marking the first confirmed occurrence in the state in decades. For landowners, ranchers, and wildlife managers, this changes the conversation immediately.
That’s why I sat down with Macy Ledbetter, a wildlife biologist with Spring Creek Outdoors, to break down what this means specifically for Texas wildlife and land management. This is not just a livestock issue. As Macy explained, the risk to free-ranging wildlife, especially whitetail deer, may be even more difficult to manage.
Why Screwworm Is a Serious Threat to Texas Wildlife
Unlike most parasites, the New World screwworm targets living tissue. The fly lays eggs in wounds or natural openings, and once the larvae hatch, they begin feeding on live flesh.
Because of this, it affects nearly any warm-blooded animal: whitetail deer, exotics, livestock, feral hogs, and even birds in certain conditions. This is what makes screwworm different, and significantly more dangerous at scale.
Historical Impact: What Happened Before
Texas has seen this before. In the 1950s and 1960s, screwworm outbreaks devastated wildlife populations, particularly whitetail deer. In some areas, landowners reported dramatic population declines tied directly to infestation.
According to current projections, similar risks exist today, especially during fawning season when young animals are most vulnerable. As we discussed in the episode, timing could not be worse: fawns are being born now, umbilical wounds create exposure points, and survival rates could be significantly impacted.
Why Wildlife Is Harder to Protect Than Livestock
One of the most important distinctions from this conversation: livestock can be managed, wildlife cannot.
With cattle, animals can be treated, monitored daily, moved and contained. With wildlife, there’s no direct treatment, no consistent monitoring, and no way to control exposure at scale. As I pointed out during our conversation, this creates a much larger long-term risk for wildlife populations and hunting operations.
How Screwworm Spreads
Screwworm spreads quickly, and quietly. Once an animal is infected, larvae multiply rapidly, additional flies are attracted to the wound, and the infestation expands exponentially.
Mobility also plays a role. Wildlife, livestock, and even domestic animals can move the problem across large distances in a short period of time. That makes early awareness critical for landowners.
The Economic Risk to Texas Landowners
The impact goes beyond biology. It affects the entire land economy.
Texas hunting alone represents a multi-billion-dollar industry. As we discussed in the episode, widespread screwworm infestation could disrupt hunting leases, wildlife populations, rural economies, feed stores and supply chains, and recreational land value. In short, this isn’t just a wildlife issue, it’s a landowner issue.
What Landowners Should Be Watching For
While large-scale control will rely on coordinated efforts, landowners can still stay alert. Key signs to watch for include animals acting erratically (head shaking, excessive rubbing), visible wounds that aren’t healing, and unusual wildlife behavior.
Early detection matters. The faster issues are identified, the better the chance of limiting spread.
Why Awareness Matters Right Now
One of the clearest takeaways from this conversation is that awareness, not panic, is the priority.
As Macy explained, this isn’t about creating fear. It’s about understanding what has happened before and recognizing what could happen again. Texas has dealt with screwworm in the past, and solutions exist. But those solutions take time, coordination, and early response.
Continuing the Conversation
Macy Ledbetter and the team at Spring Creek Outdoors work directly with landowners on wildlife management, habitat planning, and long-term stewardship across Texas.
This conversation is part of a larger discussion around wildlife health, disease management, and the evolving challenges facing Texas landowners, especially those managing hunting properties where wildlife health directly drives land value.
Watch the Full Episode
This article is based on a recent Landowner Insider conversation with Macy Ledbetter.
Work With Mock Ranches
If you’re buying, selling, or managing land in Texas, understanding issues like wildlife health, habitat management, and long-term risk is critical. Our team specializes in ranch, hunting, and investment properties across the state.
Explore more at mockranches.com.
