Effect of Herbicides on Grassland Floral Diversity and Diffuse Knapweed Control

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Increasing concern about the loss of biodiversity demands that herbicides be used with minimum risk to native plant species. It is important that any chemical containment program is designed with consideration for the conservation of biological diversity. Moreover, it is important that effective weed control is maintained to fulfill the Ministry's obligations under the Weed Control Act and the Forest and Range Practices Act to protect against shifts in plant community composition and to protect the timber and forage resources. The objectives of this research were to evaluate rates and timing of picloram and clopyralid application which effectively control diffuse knapweed with minimal effects on non-target species.