What trees are at risk?
Apple, Crab Apple, Pear, Hawthorn, Serviceberry and other fruit trees. What should I look for? Yellowish-orange colored lesions on the leaf, developing into darker spots in advanced stages. The infected leaves drop from the tree prematurely in the summer. Also look for lesions appearing on fruit later in the season. How does this harm my tree? Because the infected leaves drop prematurely in the summer, the tree spends extra energy trying to replace the lost leaves. Repeated seasons of premature leaf-drop weaken the tree, making it susceptible to other diseases, and can eventually lead to its death. Can I prevent it? Yes! We offer preventative spray treatments that begin in early March. They must be applied before the buds open, so don't delay! Where can I learn more? The University of Nebraska-Lincoln Extension has a detailed write-up here, including a list of disease resistant species.
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Conclusion... Okay, so your tree probably isn't "doomed," but it's important to know and be aware of symptoms of distress, like those listed above, so that you can take action to slow or prevent the death of your tree. Trees generally die a slow death, and more often than not, due to a number of factors. If in doubt, consult with an arborist for peace of mind! Sources:
- https://extension.umd.edu/hgic/girdling-roots-trees-and-shrubs - http://extension.psu.edu/pests/plant-diseases/all-fact-sheets/wetwood-or-slime-flux - http://ipm.ucanr.edu/PMG/PESTNOTES/pn74109.html
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Interestingly, severe symptoms of BOB have been observed only on Quercus macrocarpa var. oliviformis, a variety of bur oak that produces smaller acorns. BOB occurs primarily on naturally established trees, and especially on mature trees on upland sites that appear to be remnants of savannah forests. What are the symptoms?
If you suspect BOB has paid you a visit, it's time to call an arborist. We will come assess the damage and check for any secondary infections, then prescribe a fungicidal treatment plan (leaf sprays and/or trunk injection) to treat the infection. These treatments will need to be administered in the spring (May or June) to reduce the effects of BOB in the later summer.
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AuthorAmy Grewe, Certified Arborist & Co-Owner Categories
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April 2024
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