Be sure and tell your forage growers that if they have woody perennials (like blackberry) that after August 31, they do not need to mow or bushhog their pastures or hayfields this year. In order to control woody perennials, they must have at least one year of growth to treat them with a herbicide and be effective. The best time to treat woody perennials is in July-August while they are flowering, so preferably, you wouldn't want to mow them after July. This is when the plant is translocating materials from the leaves to the root so when spraying a herbicide it will move from the leaves to the root, killing the plant. When spraying immature plants (or plants that have been mowed in less than a year), the leaves will be killed but the roots wont be.
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