Pesticide resistance
An inherited decrease in a pest population’s susceptibility to a pesticide. It concerns a population and a particular pesticide or mode of action—not immunity to every treatment.
HOMEOWNER GUIDE
Treatment options & limits
Understand why the recommended approach depends on the pest and the property.
Why some approaches are limited
Pesticide labeling sets conditions for where, how and how often a product may be used. Applying more product or treating more frequently is not automatically permitted or more useful. We explain the relevant preparation, access and re-entry instructions for the selected service.
Wildlife protections, seasonal restrictions and required authorizations can also limit the work available. A pesticide certification and a wildlife permit serve different purposes. Some situations call for a provider with a different authorization.
Permitted, useful and necessary are different questions.
A lawful application still needs to suit the pest, life stage and treatment site. Monitoring, physical removal or prevention may be the more appropriate recommendation.
What does “not on the label” mean?
Labels apply to particular products and uses. A pest missing from a label is not automatically prohibited: federal law provides limited exceptions, including some uses against an unlisted pest at a labeled site. Restrictions and state requirements still apply. A general facts page cannot determine whether a particular application is permitted.
EPA pesticide-label questions and answers ↗
Resistance, tolerance, and treatment limits
Natural tolerance
Some pests or life stages are naturally less susceptible to particular treatments. That differs from a population developing resistance over generations.
Other reasons pests return
New insects entering from outside, missed hiding places, weathering of a treatment, or poor timing can affect control. Reappearance alone does not identify the cause.
The regulatory phrase “pesticide tolerance” can also mean an allowable residue limit on food. It is different from an insect’s ability to survive a treatment.
Have a pest concern?
Tell us what you noticed and where your property is located.
Request an inspection ↗Sources & further reading
- EPA: Integrated Pest Management Principles.
- EPA: Identify and Prevent Rodent Infestations.
- EPA: Introduction to Pesticide Labels.
- Virginia DWR: Commercial Nuisance Animal Permit.
- West Virginia DNR: Nuisance Wildlife.
- EPA: Pesticide Labeling Questions & Answers.
- EPA: Pesticide Resistance Management Labeling.
- University of California IPM: Managing Pesticide Resistance.
- University of California IPM: Glossary.
- EPA: Pesticide Tolerances.