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- Diffuse Knapweed: Biennial <br /> Characteristics: <br /> Two year growth cycle.Grows as a rosette then bolts up to seed production the second year.A prolific seed <br /> producer so prevention of seed head production is important. <br /> 1 02 <br /> Diffuse Knapweed Rosette D�ffuse Knap.yeed Flower heads(May Mature Diffuse Knapweed <br /> be.,,Wte or purp'e) <br /> Methods of Control: <br /> -Chemical:Spraying Knapweed should be done priorto seed head production.Control is most effective on the <br /> rosette stage but will work on mature plants as well. <br /> -Manual:Hand pulling and bagging small populations,especially if at mature stage. <br /> Effective Herbicides:(Application rates shoud be derived from product fabe s specific to weed species and tank mix,additiona!products may be used but <br /> shou d be a se.ect ve broad leaf herbicideto avoid damage to desirab,egrasses) <br /> Milestone(amino pyralid) <br /> Rifle(Dicamba) <br /> Curtail(Clopyralid+2,4-D) <br /> Chlorsulfron <br /> Figure4.Specific practices for the control of Diffuse Knapweed. <br />