Illinois Field Crop Applicators Practice Test

What type of herbicide application is recommended when herbicide persistence is short?

1. Higher labeled rate

2. Lower labeled rate

3. Standard labeled rate

4. Increased frequency of application

The correct answer is: Lower labeled rate

When herbicide persistence is short, using a lower labeled rate is recommended to effectively manage herbicide application. Short persistence means that the herbicide acts quickly and degrades rapidly in the environment, which may limit its residual control over time. Applying a lower labeled rate allows for sufficient control of the target weeds without the risk of potential crop damage or environmental concerns that often arise with higher rates. It also aligns with Integrated Pest Management (IPM) principles by minimizing the chance of developing herbicide-resistant weed populations. By opting for a lower labeled rate, the applicator can still achieve effective weed control while maintaining sustainable practices, such as reducing chemical runoff and minimizing exposure to non-target organisms.