Texas Pesticide Applicator Practice Exam

What is a characteristic of selective herbicides?

1. They kill all plants indiscriminately

2. They target specific weed species

3. They are used only in residential areas

4. They require multiple applications

The correct answer is: They target specific weed species

Selective herbicides are designed to target specific weed species while leaving desirable plants largely unharmed. This characteristic makes them particularly valuable in a variety of settings where it is important to remove unwanted vegetation without damaging crops, lawns, or gardens. For example, a selective herbicide might effectively control dandelions or clover in a grassy area without harming the grass itself. This targeted approach allows for effective weed management while preserving the health of the desired plants in the environment. Other options suggest characteristics that do not apply to selective herbicides. Some imply that all plants are affected, which isn’t true, as selective herbicides are formulated to minimize damage to non-target plants. Additionally, the use of selective herbicides is not limited to residential areas, as they can be beneficial in agricultural settings, parks, and other landscapes. Finally, while some herbicides may require multiple applications to be effective, this is not a defining trait of selective herbicides specifically; their primary function is their ability to discern between various types of plants during application.