Pesticide Resistance: What Commercial Property Managers Need to Know

When commercial property owners and managers review what’s working, what isn’t, and where small changes can make a big impact, pest management is one area worth a closer look. One resolution worth adding to that list is taking a closer look at your pest management program, specifically how your service provider addresses pesticide resistance.

One challenge facing pest control programs is pesticide resistance. While it can sound technical, resistance is a practical, real-world issue that property owners and managers should understand well enough to have informed conversations with their pest control provider.

Pests are constantly adapting to the traps, baits, and products used to control them, which means effective pest management is never a “set it and forget it” process. Understanding what resistance is and how it can impact your facility helps set the table for more effective pest control in the year ahead.

What Is Pesticide Resistance?

Pesticide resistance occurs when a product that once worked well becomes less effective over time. Resistance develops gradually when the same products or control methods are used repeatedly. The pests that survive exposure pass along their ability to tolerate that treatment, eventually leading to entire populations that are barely affected.

“Resistance isn’t new, it’s always been an issue, especially in agriculture,” says Ashley Roden, BCE, Technical Director for Sprague Pest Solutions. “Pests are always looking for an advantage, and if we give them the same playbook over and over, they’ll find one.”

Resistance can be physical, metabolic, or behavioral. Repetition, underdosing of applications, lack of product rotation, and poor sanitation all accelerate the process. Every repeated mistake gives resistance an opportunity to grow.

How Common Is Resistance?

Resistance is fairly common across the pest control industry, and it has driven changes in control and prevention methods since the industry began. Some pests are more prone to resistance due to short life cycles, high reproduction rates, and overlapping generations, which allow adaptations to spread quickly.

Not every challenge with controlling pests, however, is caused by resistance. Sometimes, what looks like resistance is actually reinfestation from outside the building, incorrect application, or reliance on a single control method.

“All properties aren’t equal when it comes to resistance,” explains Roden. “What appears to be resistance can also be poor sanitation, bad placement of product, or control methods that aren’t being fully supported by the facility.”

That’s why diagnosis matters. Before changing products or escalating treatments, it’s important to evaluate conditions, practices, and pest pressure holistically.

Pests of Concern

Certain pests are especially known for resistance challenges. Bed bugs (Cimex lextularius), for example, rebounded in the late 1990s after developing resistance to commonly used insecticides. Modern bed bug programs rely on carefully selected products paired with physical controls like vacuuming, steaming, and, in some cases, heat treatments.

German cockroaches (Blattella germanica) – a common pest in commercial properties including restaurants, food service and apartments – also present challenges. Effective pest control programs require rotating pesticide classes, improving sanitation, and reducing access to food and water.

Rodent management brings a different set of considerations.

“With rodents, more bait doesn’t equal more control,” says Roden. “Behavior drives success. Trapping, exclusion, and removing food and water sources are critical to establishing and maintaining an effective rodent management program.”

Why Resistance Matters to Your Facility

Pesticide resistance is more than a pest control issue; it can be a business risk. Resistant pests can lead to increased pest populations and contamination potential, downtime and additional expenditures to remediate the issue, product spoilage and recalls, and poor audit scores. Resistance can also develop faster in closed, stable environments like food plants.

Everyone in the facility plays a role in slowing resistance, from sanitation teams to operations staff to management.

What Are the Solutions?

The most effective defense against resistance is Integrated Pest Management (IPM). IPM emphasizes using multiple control strategies together rather than relying on a single product or method.

“Never rely on just one control method,” Roden emphasizes. “Programs have to be IPM-driven and fully supported by the facility.”

Property managers should be prepared to ask their pest control service provider the following questions:

• Are the products being rotated across different active ingredients?
• Are the pests at my facility known to develop resistance?
• If an issue persists long term, could resistance be a factor or is something else contributing?
• Are we using enough non-chemical controls, like traps, exclusion, and sanitation?

For rodents, that may mean increasing snap traps outdoors, improving incoming product inspection protocols, or strengthening exclusion practices. For insects, it may involve adjusting sanitation, reviewing application practices, or rotating control tools.

Data also plays a critical role. Pest trend reports, trap captures, and employee observations can reveal early warning signs, such as plateaus in activity despite treatment. The earlier resistance or contributing conditions are identified, the easier it is to correct.

The takeaway for commercial property managers is straightforward: resistance is real, manageable, and best addressed through partnership. By staying informed, asking questions, and working closely with your pest control service provider, you can help protect your facility and keep pest control programs effective for the long term.

New Year’s Checklist: Questions to Ask Your Pest Control Partner

As you plan for the year ahead, use these questions to spark productive conversations about pesticide resistance and long-term pest control success:

• Are the products being rotated across different active ingredients or control classes? Rotation helps slow resistance and keeps treatments effective over time.
• Are the pests at my facility known to develop resistance? Some pests, such as cockroaches, bed bugs, house flies, and rodents, are more prone to resistance than others.
• If a pest issue keeps returning, could resistance be a factor or is something else contributing? Persistent activity may point to sanitation gaps, reinfestation, or device placement issues rather than product failure alone.
• Are we relying too heavily on one control method? Effective programs use a mix of chemical and non-chemical tools, including trapping, exclusion, and environmental controls.
• What facility conditions could be making control more difficult? Food, water, harborage, and access points all influence pest pressure and resistance risk.
• What does our pest trend data tell us? Reviewing pest trend data, pest sighting logs, and activity trends can help detect problems early and guide smarter adjustments.

Starting the year with these conversations helps ensure your pest management program is proactive, data-driven, and built for long-term success, not just short-term control.