Mainly, you are trying to reduce sporulation by 1) minimizing overhead irrigation and 2) timing irrigation to coincide with natural dew formation. In addition to chemical options, there are several cultural control strategies you can deploy. For more information, refer to “ Blueberry growers need to focus on anthracnose fruit rot as bloom ends.” Other control methods We recently posted an updated list of fungicide efficacy against anthracnose and alternaria fruit rot. This resource has good information about fungicide choices based on disease and fungicide effectiveness. MSU Extension annually updates the Michigan Fruit Management Guide (E0154). Several fungicides are rated good to excellent at controlling the various fungi that cause twig blight. Bloom and post-bloom fungicide spray target these infections.Īs we transition from pre-bloom to post-bloom disease control, careful choice of fungicides to control the disease is important. They can occur before, during and after bloom. Colletotrichum infections require warm and wet conditions. Many fungicides have good activity against mummy berry and phomopsis blight. Research on anthracnose and phomopsis blight has shown that most twig blight and blossom infections occur at bud break. Target it early next spring, not now after bloom. Early sprays of copper can reduce bacterial canker. No antibiotics are registered in blueberries. Pseudomonas canker is caused by a bacterium and fungicides do not control bacteria. Control methods for blighted tissue Chemical optionsĬontrols are the most effective if they are applied prior to blight infections. If you want more information about your blighted samples, you need to submit actual samples to Plant & Pest Diagnostics at Michigan State University for a positive identification. Photo by Laura Miles, MSU Plant & Pest Diagnostics. Blighted leaf tissue observed in the Muskegon area this season, likely caused by early winter damage but several plant pathogens recovered from this tissue. Blighted bud tissue of blueberries observed in late May, likely caused by freeze events. Blighted shoot tissue with characteristic anthracnose symptoms on shoot tissue. This also was likely related to early season freeze damage (Photo 5). This looks similar to a mummy berry infection, but no characteristic conidia were observed.
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