![]() ![]() ![]() There are no known biological control agents for use on hawkweeds in the United States. (Note: pesticide product registration is renewed annually and product names and formulations may vary from year to year.) ![]() When using herbicides, always read and follow all label instructions and obey all label precautions. Aminopyralid products will not harm grass and can be used around livestock (provided all label precautions are followed). It is also effective in the fall before a killing frost. Be aware, glyphosate is non-selective and will injure any plants that it comes in contact with, including grass.įor selective control of hawkweed in agricultural settings (pastures, hayfields, etc.), an herbicide containing the active ingredient aminopyralid (example: Milestone, Milestone VM, etc.) may be applied in the spring to plants in the pre-bud to early bud growth stage. Spray each plant thoroughly on the stems and leaves, enough to be wet but not dripping. The goal is to insure all plants have emerged. Spot spraying with an herbicide containing the active ingredient glyphosate (Roundup Pro, Glyfos, etc.) may be used effectively in the spring while the plant is in the pre-bud to early bud growth stage. Treatment with nitrogen will help other grasses to competitively suppress hawkweed growth.Įarly season treatment with 2, 4 D plus dicamba (as in Weedmaster, etc.) can be an effective chemical control for Yellow Devil hawkweed. ![]() Bag and dispose of the plants in the garbage. Monitor the site where plants have been dug out for possible re-growth. Be aware that this species of hawkweed can reproduce from small root fragments, so it is important to get the whole root. Hand pulling or digging up isolated plants and small patches can help control Yellow Devil Hawkweed. Above all, prevent plants from going to seed. As usual with invasive species, the best control measure for Yellow Devil Hawkweed is prevention. The pollen released from its flowers discharges toxins that inhibit the seed germination, seedling emergence, and saprophytic growth of surrounding plants.Įarly detection and eradication are important to prevent the spread of hawkweed. Yellow Devil hawkweed is one of only 6 known Pollen Allelopathic plants. It infests meadows, roadsides and fields and is especially invasive on poorer acidic soils. Its creeping growth fills in the gaps between other plants forming mats of rosettes and prevents other plants from establishing seedlings. Hawkweeds are aggressive competitors of native plants and desirable vegetation. In mid to late spring the stems are topped with 3 to 50 bright yellow flower heads in a flat-topped cluster, closely resembling a dandelion. The top of the leaf is smooth while the underside has scattered, bristly hairs, particularly along the mid-rib. The single flowering stem grows up to 32 inches tall, and is sparsely covered with bristly blackish hairs. The plant has a basal rosette of narrow, pointed leaves, which are covered with a whitish or bluish waxy coating. Meaning: From the Greek meaning a hawk, referring to belief that hawks fed on the plant to strengthen eyesight Yellow Devil Hawkweed Hieracium floribundum ![]()
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