Tennessee Ornamental and Turf Pest Control Practice Exam 2025 - Free Pest Control Practice Questions and Study Guide

Question: 1 / 400

How many applications of Devrinol 50-DF Ornamental are typically needed for adequate weed control in temperate areas?

One application

Two applications

For adequate weed control in temperate areas, two applications of Devrinol 50-DF are typically needed. This herbicide is a pre-emergent treatment that requires enough residual activity to prevent weed seed germination.

In temperate regions, the growing season has distinct periods where weed growth can peak, so a single application may not provide sufficient control throughout the entire relevant period. The timing of applications is crucial; often, the first application is made before the expected weed germination period, and the second application can help maintain control as the season progresses and new weeds may emerge. Therefore, applying Devrinol 50-DF twice ensures that there are enough active ingredients in the soil to inhibit a broader range of weed types over the entire growing season.

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Three applications

Four applications

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