Spring is here, and with it comes longer days, warmer weather… and unfortunately, flies. But this April, in honor of Earth Day, we’re celebrating a nature’s solution to fly control that helps reduce pesticide use while keeping your animals comfortable: Fly Predators!
These tiny but mighty insects work behind the scenes to kill flies before they hatch, giving you effective, chemical-free fly control all season long. Let’s take a closer look at how mother nature’s fly fighters work their magic.

Life Cycle of a Fly Predator
Unlike pest flies that buzz around and bite, Fly Predators never bother you or your animals! They stay laser-focused on their mission: breaking the fly life cycle before flies can emerge. Here’s how:
- Hatch & Hunt – Once released, Fly Predators hatch and seek out pest fly pupae, the cocoon-like stage where flies develop.
- Parasitize the Fly Pupa – Fly Predators lay their eggs inside the fly pupae, preventing adult flies from ever hatching.
- Growth & Temperature Impact – Fly Predator eggs develop within the fly pupae. Warmer temperatures speed up emergence, while cooler temperatures slow it down.
- Eliminate Flies – As new Fly Predators emerge, they continue the cycle of seeking out and parasitizing more fly pupae, dramatically reducing the pest fly population.
- Continuous Protection – By releasing Fly Predators monthly, you create an ongoing cycle of proactive fly control, killing up to 85% of flies before they ever become a nuisance.
- Winter Pause – When temperatures drop, Fly Predators naturally enter dormancy, pausing their lifecycle until warm weather returns.
Why Fly Predators Are a Must-Have This Spring
- 🌱 Earth-Friendly & Chemical-Free – Fly Predators reduce reliance on fly sprays and pesticides, making them a safer choice for you, your animals, and the environment.
- 🐴 Effortless Fly Control – Simply sprinkle them once every 3-4 weeks and let nature take care of the rest.
- 💰 Cost-Effective Solution – By killing flies before they hatch, you’ll save money on fly sprays, fly masks, and other reactive solutions.
- 👩🌾 Proven by Happy Customers – With over 45 years of success, Fly Predators are trusted by thousands of horse owners, ranchers, and farmers across the country.



How to Get Started with Fly Predators
- Order Now – Get your first shipment of Fly Predators at Spalding-Labs.com
- Wait for Emergence – Keep them in a warm, shaded spot until you see at least a dozen tiny insects moving.
- Release in Fly Breeding Areas – Sprinkle them near manure piles, stalls, paddocks, and other areas where flies reproduce.
- Repeat Regularly – For best results, continue releasing Fly Predators every 3-4 weeks throughout fly season.
This Earth Day, join us in choosing a fly control method that’s safe, effective, and sustainable. Let’s work with nature to keep our barns and pastures fly-free!
Want to learn more? Visit our Education Center for expert fly control tips and advice, or find answers to frequently asked questions!