A herbicide is a chemical used to control or kill weeds. This module discusses how herbicides interact with weeds. It also introduces several important terms related to herbicides and herbicide use that may be encountered in technical discussions about herbicides.

Students completing this module will:

• Know the terminology associated with herbicide use, including tolerance, chemistry, efficacy, timing, and placement of applications.
• Understand how herbicides are categorized according to their mechanism of action.

Successful completion of this module will earn you 1 recertification credit for New York State DEC certified pesticide applicators in categories 1a, 2, 3a, 3b, 5a, 6a, 9, 10, 21, 22, 23, 24, and 25.

*If you are certified in Maryland, Pennsylvania, Rhode Island, or West Virginia, check the appropriate state-specific credit information page under the "Store Menu" to confirm approval and recertification credit values.

*Connecticut, Maine, Massachusetts, New Hampshire, and Vermont have approved all DLC courses and awards the same credits as New York.