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Emergency registration for thrips


June 3, 2009
By Jim Chaput OMAFRA Minor Use Coordinator

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June 3, 2009, Guelph, Ont. – The Pest Management Regulatory Agency
(PMRA) recently announced the approval of an emergency use renewal
registration for Carzol SP.

June 3, 2009, Guelph, Ont. – The Pest Management Regulatory Agency (PMRA) recently announced the approval of an emergency use renewal registration for Carzol SP.

The product is registered for control of onion thrips on dry bulb onions in Nova Scotia, Ontario, Manitoba and Alberta.

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Carzol SP is already labelled in Canada for control of mites and leafhoppers on apples, pears, peaches and nectarines. In 2008, the emergency use registration of Carzol helped dry bulb onion producers manage this serious pest problem. A complete minor use submission is under review to seek eventual, full registration of CARZOL for thrips control on dry bulb onions in Canada.

Onion thrips, Thrips tabaci (Lindeman), are a pest of onions around the world. In Canada, it is considered a key pest wherever onions are grown and the number one pest of onions in most provinces.   Various life stages of onion thrips actively feed on onion leaves, reducing photosynthesis, reducing plant vigour and yield, and vector and transmit Iris Yellow Spot Virus (IYSV).

In the U.S., onion thrips were ranked as the number one pest requiring urgent attention due to lack of effective solutions at the 2005 US IR-4 Food Use workshop. Rapid resistance development to all available, registered materials has become widespread in North America and around the world. Carzol SP was identified as a viable solution to help manage onion thrips. There have been no new products registered in Canada for onion thrips management in several years and control failures continue to increase. 

The emergency use registration of Carzol SP will help in the interim to manage resistant thrips populations; however, management of onion thrips will require a comprehensive IPM and resistance management program with access to all available tools and strategies. The following is provided as general information only. Users should consult the complete label before using Carzol SP.    

CARZOL SP can be used for control of onion thrips in dry bulb onions in Ontario, Nova Scotia, Manitoba and Alberta until October 31st, 2009 only. Carzol SP can be applied once at a rate of 1.4 kg product per hectare or Carzol can be applied twice at a rate of 0.84 kg product per hectare at a seven to 10 day interval. Do not exceed 1.68 kg per hectare per year. A minimum spray volume of 94 L water per hectare is recommended and a 30-day pre-harvest interval is permitted.

For copies of the emergency use label contact Jennifer Allen, OMAFRA Vegetable Crops specialist at Guelph (519) 826-4963, Jim Chaput, OMAFRA, Guelph (519) 826-3539 or visit UAP Canada Inc. or N. M. Bartlett.


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