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21. Biological Control of Leafy Spurge in Manitoba - Progress to Date and Prospects for the Future.  Carla L. Allen, Weed Specialist, Manitoba Agriculture.

Manitoba Agriculture has been involved in biological weed control since 1974. To date more than 25 different insect species have been released on nine different weeds. Most efforts have concentrated on leafy spurge as a number of different agents have been released on this noxious weed. The Aphthona nigriscutis AND Aphthona cyparissiae have provided the greatest suppression of leafy spurge since the first release in Manitoba in 1983. The Manitoba Weed Supervisors Association has been an excellent vehicle for redistribution of insects. As of 1994, there were more than 850 Aphthona nigriscutis and more than 250 Aphthona cyparissiae release sites in the province. Many of these sites are harvestable and show significant weed suppression. Lobesia euphorbiana has successfully established in Manitoba and reduces seed set considerably. Two other Aphthona spp. have established in Manitoba: A. lacertosa and A. czwalinae. Both insects thrive on heavier soil types and A. czwalinae has survived spring flooding.

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