Rodenticide Field Tests: Surprising Results for Durability & Bait Appeal 2026

When it comes to rodent control, not all bait blocks are created equal. In a series of rigorous field tests conducted in northern Italy, we put several commercial rodenticides to the test — and the results were eye-opening. From melting blocks to mold growth and palatability issues, the data reveals which products truly stand up to heat, humidity, and hungry rodents. Below, we break down the trials, the winners, and the lessons learned for pest management professionals and homeowners alike.

Why Field Testing Matters for Rodenticide Performance

Laboratory conditions can never fully replicate the real-world challenges of pest control. Temperature swings, moisture, dust, and competing food sources all affect how a rodenticide performs. That’s why we conducted side-by-side field trials in Tortona and Cremona, Italy, during the late summer and fall of 2023. Our goal was to evaluate structural stability, palatability, and overall efficacy of two key products: Enderat Block Pro (brodifacoum-based) and Askarat Block Pro (bromadiolone-based), comparing them against a competitor’s red bromadiolone block.

Test 1: Heat Resistance in Tortona (September 2023)

In September 2023, at an operational building in Tortona, maximum temperatures reached 31°C (88°F). The competitor’s red bromadiolone block — mounted on a metal rod inside a bait station — became so soft from the heat that it actually slipped off the rod. In the same station, our Enderat Block Pro remained firm and showed clear signs of gnawing by Mus spp. In another bait station, the red block had completely liquefied, while Enderat Block Pro not only held its shape but continued to attract feeding activity.

Test 2: Moisture and Mold Resistance in Tortona (October–November 2023)

On October 13, 2023, we placed Askarat Block Pro (0.005% bromadiolone) inside bait stations at a logistics site in Tortona. The follow-up inspection occurred on November 10, 2023 — approximately one month later. During that period, heavy rainfall fell from November 2 to November 9. Despite the wet conditions, the Askarat blocks maintained their structural integrity with no mold growth whatsoever. Even in stations where gastropods were present and humidity was extreme — at times nearly submerging the blocks — the bait remained intact and palatable.

Test 3: Palatability and Efficacy in Cremona

Field palatability tests were conducted at a site in Cremona. Within 15 days of bait placement, a young Rattus spp. specimen was found dead near an Askarat Block Pro station — clear evidence of both acceptance and lethal efficacy. The blocks showed consistent gnawing marks, indicating strong bait uptake even in environments with alternative food sources.

Key Findings at a Glance

• Heat stability: Enderat Block Pro (brodifacoum) resisted softening up to 31°C, while competitor blocks liquefied or deformed.
• Moisture resistance: Askarat Block Pro (bromadiolone) remained mold-free and structurally sound after weeks of heavy rain and near-submersion.
• Palatability: Both Enderat and Askarat blocks showed consistent gnawing activity and led to rodent mortality within 15 days.
• Rodent species targeted: Effective against Mus spp. and Rattus spp. in real-world conditions.

What This Means for Pest Control Professionals

Choosing the right rodenticide isn’t just about the active ingredient — formulation matters. A block that crumbles, melts, or grows mold will be ignored by rodents, wasting time and money. Products like Enderat Block Pro and Askarat Block Pro are engineered to withstand environmental stress while remaining highly attractive to target pests. For those dealing with persistent raccoon issues, check out our guide on the best poison for raccoons for safe and effective outdoor baiting strategies.

Frequently Asked Questions

1. Why do some rodenticide blocks melt in high heat?

Lower-quality blocks use binders and fats with low melting points. When temperatures exceed 30°C (86°F), these ingredients soften, causing the block to deform or liquefy. Premium blocks like Enderat Block Pro use heat-stable formulations that remain firm even in hot weather.

2. Can rodenticides grow mold in humid conditions?

Yes, if the bait contains organic fillers or inadequate preservatives, mold can develop within weeks. Moldy bait is rejected by rodents. Askarat Block Pro showed zero mold after a month in near-submersion conditions, thanks to its advanced formulation.

3. How quickly should I see results after placing bait blocks?

In our tests, rodent mortality occurred within 15 days of bait placement. However, results depend on rodent population size, alternative food availability, and bait acceptance. Consistent monitoring is key.

4. Are brodifacoum or bromadiolone better for outdoor use?

Both are effective anticoagulants. Brodifacoum (Enderat Block Pro) is often preferred for single-feed efficacy, while bromadiolone (Askarat Block Pro) offers a slightly lower toxicity profile. For outdoor use, choose a block with proven weather resistance.

5. Can I use these rodenticides around pets or wildlife?

Always use tamper-resistant bait stations and follow label directions. For non-target species like raccoons, consider species-specific baits. Learn more about safe options in our best poison for raccoons article.

Final Thoughts

Field testing reveals what brochures cannot: real-world performance under stress. Whether you’re a professional exterminator or a homeowner tackling a rodent problem, choosing a rodenticide that resists heat, moisture, and mold is critical for success. For more tips on outdoor pest control, explore our yard and outdoors blog and home & garden guides.

Author: Paulo Vivere