As a property owner, you want to keep your eyes open for a few common symptoms, such as leaf spots, powdery mildew appearing on the leaf surfaces and leaves turning yellow out of season. Leaf spots on trees are generally not important in the scheme of things but can be unsightly.
Some leaf spots are caused by a parasitic alga (Cephaleuros virescens). Cool wet springs are conducive to the formation of leaf spots. There are three different fungi that are the primary cause of leaf spots in trees. The majority of leaf spots are caused by fungi, but some are caused by bacteria. Bacterial blight causes brown leaf spots (often surrounded by yellow areas) and rapid browning of young shoots. The organisms that cause leaf spots survive in fallen infected leaves and twigs.
Leaf spots on trees are very common and generally do not require spraying. Most trees tolerate leaf spots with little or no apparent damage. Mature leaf spots produce spores or bacteria that can be spread throughout the canopy, which can start a second set of leaf spots or cause new infections on other plants. The later in the season that leaf spots develop the less need for alarm.
Unless there is substantial foilage loss, there really is no cause for alarm. Contact
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