Alliums Herbicides Pest Management Vegetables Weed Management

Minor use label expansion granted for Prowl H2O Herbicide for weed control on green onions and leeks

J. Chaput, OMAFRA, Minor Use Coordinator, Guelph

The Pest Management Regulatory Agency (PMRA) recently announced the approval of a minor use label expansion for PROWL H2O Herbicide (pendimethalin) for control of weeds on green onions (mineral soil) and transplanted leeks (mineral soil) in Canada. Prowl H2O herbicide was already labeled for management of weeds on corn, soybeans, snap beans, adzuki beans and dry bulb onions in Canada. 

These minor use submissions were sponsored in 2010 and 2011 by the minor use office of OMAFRA in response to minor use priorities identified by producers and extension personnel in Canada. Additional data supporting these projects was provided by Dr. Darren Robinson, S. Vink, U. of G., Ridgetown; Dr. C. Swanton and K. Chandler, U. of G. main campus; Dr. J. O’Sullivan, R. Grohs, U. of G., Simcoe as well as Dr. B. Zandstra, MSU, Dr. D. Doohan, OSU and colleagues in Quebec.

Weed control is an important component of green onion and leek production and has been identified as a priority by producers for several years. The registration of Prowl H2O herbicide is an important step towards improving the weed management and resistance management toolkit.

The following is provided as a general outline only. Users should consult the complete label before using Prowl H2O herbicide.

Leeks, green onions:

Prowl H2O herbicide can be used for control of selected annual weeds in green onions and transplanted leeks grown on mineral soils at a rate of 2.37 L per ha. Apply after transplanting of leeks and before weed emergence. Apply at the 2 – 3 true leaf stage of green onions after the crop has emerged. Prowl H2O can be applied in a minimum of 200 L water per ha.

Do not apply Prowl H2O herbicide to green onions and leeks within 30 days of harvest.

Prowl H2O herbicide should be used in an integrated weed management program and in rotation with other management strategies. Follow all other precautions and directions for use on the Prowl H2O herbicide label.

We wish to acknowledge the personnel of BASF Canada Inc. for their support of this registration and the personnel of the Pest Management Regulatory Agency for evaluating and approving this important pest management tool.

For copies of the new supplemental label for green onions and leeks contact Kristen Callow, OMAFRA, Harrow (519) 738-1232 or visit the BASF Canada website at

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