Early- and mid-season insects in cotton crops are one of many threats growers face that can significantly impact lint yield and fiber quality.
Applying integrated pest management (IPM) principles helps protect your seed investment while preventing pest-control tools from losing effectiveness. The goal is not simply to eliminate pests, but to optimize the timing of interventions and slow the development of insecticide resistance.
Effective IPM programs begin before you put a single seed in the ground and continue well into the growing season.
Variety selection and cultural control of insects in cotton crops
The foundation of any cotton operation is the seed you plant, and choosing the right variety based on expected pest pressure and local growing conditions can help the season start on the right foot.
Selecting high-quality seed and varieties adapted to local environments helps establish a strong stand and promote early plant vigor. Varieties with appropriate maturity ratings, insect-resistant traits and Bt technology should also be considered so plants can develop under favorable conditions and limit the need for cotton insecticide applications while protecting developing bolls.
Cultural practices also influence pest pressure. Planting dates can affect how quickly seedlings grow and how vulnerable they are to early feeding injury. Managing surrounding weeds is equally important, since these plants can serve as alternate hosts for insects such as thrips and plant bugs that later move into cotton fields.
Finally, maintaining beneficial insects in cotton is an important part of an integrated strategy. Predators such as lady beetles and other natural enemies help suppress pest populations and can reduce reliance on chemical control when managed carefully.
Early pest management: seed treatments and scouting for cotton crop insects
A proactive approach to pest management is better than a reactive spray-and-pray approach. This involves seed treatments and field scouting regularly after emergence.
For example, seed treatments are recommended for thrips management if you are experiencing cooler springs. Thrips can damage seedlings, causing growth stunting, delays in maturity and reductions in yield. However, several regional types have become resistant to neonicotinoids¹, and systemic cotton insecticides can fail due to wet weather leaching out the seed treatment, and a foliar spray may be necessary.²
The alternative to relying solely on seed treatments is a robust scouting program. By monitoring symptoms and pest injury early on, growers can determine the precise moment a supplemental foliar treatment is required.
Economic thresholds and scouting for mid-season insects in cotton
Scouting is critical early in the season, but it is just as important as cotton moves into squaring and boll development. As the crop grows, new insect pests can begin to threaten yield if fields are not monitored regularly.
Cotton fleahoppers, plant bugs such as lygus bugs, and bollworms can begin feeding on plants and bolls during the mid-season. When these pests appear, the temptation may be to apply a broad-spectrum cotton insecticide immediately to protect the crop.
However, applying a cotton insecticide based on a calendar schedule or at the first sign of a pest can sometimes create more problems than it solves.
Economic thresholds can help determine when pest populations are likely to cause yield losses that justify treatment. Applying insecticides only after these thresholds are reached helps ensure treatments are applied under the right conditions while also preserving beneficial insect populations.³
When predators are removed, secondary pests such as aphids or spider mites may flare up and create additional management challenges later in the season.
Mitigating cotton insecticide resistance risk
While economic thresholds can protect your bottom line and beneficial insects, it also protects your future strategies.
Repeated use of the same mode of action can lead to the development of a resistant population. Here are a few solutions to reducing those resistant insect populations:
- Use the full rate recommended on the label
- Apply cotton insecticides when above the economic threshold
- Rotate cotton insecticides with different modes of action
- Use Bt cotton varieties and adhere to refuge requirements
Additionally, you can use beneficial insects and biocontrol practices to reduce your reliance on a single control method.
An integrated pest management approach not only improves pest control in the current season but also helps ensure that valuable insect management tools remain effective for years to come.
Experts are available to help you make your pest management decisions. Reach out to your seed retailer, a nearby extension office agent or a seed company professional like your regional BASF representative.
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Endnotes
- Reisig, Dominic. “Thrips.” NC State Extension Cotton Portal, North Carolina State University Extension, https://cotton.ces.ncsu.edu/insect-scouting-guide/thrips/
- Reisig, Dominic. Managing Insects on Cotton. NC State Extension, North Carolina State University, 29 Jan. 2026, https://content.ces.ncsu.edu/pdf/managing-insects-on-cotton/2025-01-30/12.ging_Insects.pdf
- Simon, Logan, and Anthony Zukoff. “Mid-Season Insect Management for Cotton Production.” Agronomy eUpdate, Kansas State University Extension, 11 July 2024, https://eupdate.agronomy.ksu.edu/article/mid-season-insect-management-for-cotton-production-599-5
