Weed Management Handbook

Plants that are perennial in habit but lose their leaves during winter.

Treatments applied to frills or girdles that have been made through the bark into the wood of the tree.

Waxy, fatty material that covers plant surfaces such as leaves.

Conservation Reserve Program.

Resistant plants that are resistant to other herbicides with the same site of action.

The practice of growing different crops in succession on the same land, chiefly to preserve the productive capacity of the soil.

A herbicide that is phytotoxic by contact with plant tissue rather than as a result of translocation. Only that portion of a plant contacted is directly affected. Young seedlings are killed, but perennials may recover because of the uninjured parts below ground.

The amount of active ingredient or herbicide in a quantity of diluent, expressed as percentage or as pounds per gallon (lb/gal), etc.

Two compounds or products that can be mixed with- out affecting each other's performance.

Results produced in test animals exposed for long periods to chemicals.