Alliums Insecticides Pest Management

Delegate WG for Management of Thrips and Leek Moth on Bulb Vegetables in Canada

J. Chaput, OMAFRA, Minor Use Coordinator, Guelph

The Pest Management Regulatory Agency (PMRA) recently announced the approval of a minor use label expansion for DELEGATE WG Insecticide (spinetoram) for suppression of onion thrips and leek moth on bulb vegetables, crop group 3-07 in Canada. Crop group 3-07, bulb vegetables includes dry onions, green onions, leeks, garlic, shallots, etc.

Thrips on Onion Plant

DELEGATE WG Insecticide was already labeled in Canada for management of a number of insect pests on a wide range of crops and crop groups and has a proven record of efficacy and safety. DELEGATE WG Insecticide was also the subject of an emergency use for onion thrips in 2011.

This minor use project co-sponsored by the minor use office of OMAFRA and Agriculture & Agri-Food Canada, Pest Management Centre (AAFC-PMC) was submitted in 2010 in response to minor use priorities identified by producers and extension personnel in Canada.

This registration will provide bulb vegetable growers with an urgently needed pest management tool to help manage thrips and leek moth in Canada.

The following is provided as a general outline only. Users should consult the complete label before using DELEGATE WG Insecticide. DELEGATE WG Insecticide can be applied as a foliar spray at 200 – 336 g per hectare for suppression of onion thrips and leek moth on bulb vegetables. Apply in 300 – 500 L water per hectare on a 7 – 10 day interval based upon field monitoring. Apply when onion thrips 1st appear targeting hatching eggs and small nymphs. For leek moth, apply one week after peak pheromone trap capture, targeting eggs at hatch or small larvae. Use a maximum of 3 applications per growing season and do not apply within 3 days of harvest of bulb vegetables.

DELEGATE WG Insecticide should be used in an integrated pest management program and in rotation with other management strategies. Follow all other precautions and directions for use on the DELEGATE WG Insecticide label.

We also wish to acknowledge the personnel of Dow AgroSciences 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 contact Marion Paibomesai, OMAFRA, Guelph (519) 826-4963, Jim Chaput, OMAFRA, Guelph (519) 826-3539 or visit the Dow Agrosciences website at

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