Pacific Northwest Weed Management Handbook

Onion

Joel Felix

Revised:

March 2020

This article includes information on dry bulb and green onions, leeks, shallots, and spring onions.

Site Preparation, Stale Seedbeds, and Selective Postemergence Applications
Preplant
Preemergence, Delayed Preemergence, Early Postemergence
Postemergence
Sprout Inhibition

Use pesticides safely!

Wear protective clothing and safety devices as recommended on the label. Bathe or shower after each use.
Read the pesticide label—even if you’ve used the pesticide before. Follow closely the instructions on the label (and any other directions you have).
Be cautious when you apply pesticides. Know your legal responsibility as a pesticide applicator. You may be liable for injury or damage resulting from pesticide use.

Trade-name products and services are mentioned as illustrations only. This does not mean that the participating Extension Services endorse these products and services or that they intend to discriminate against products and services not mentioned.