Everyone looks up when observing trees. However, you’ll often find arborists looking down! That’s because when it comes to assessing tree health, one of the most critical factors is a healthy root system. Focusing solely on noticeable issues in the canopy, like yellowing leaves, may cause you to miss the culprit responsible for those issues, which is often found below ground.
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Phytophthora root rot is a disease of many trees and shrubs. The disease derives its name from the Greek language and literally means “plant destroyer.” As such, this is a fitting name for the pathogen, which can kill its host by growing through the roots upward. Phytophthora root rot thrives in wet and poorly drained soil conditions and attacks a wide range of species.
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People have grown citrus trees since ancient times and helped spread these fruit-bearing favorites around the world! Citrus are native to Southeast Asia. However, humans brought them to increasingly distant places over time. Moving along trade routes, various species arrived in the Middle East and Mediterranean, then on to Europe. Spanish conquistadors first introduced citrus to North America in Florida. Now, citrus are some of the most common landscape fruit trees in California, Arizona and Texas.
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Mulching the ground beneath your trees and shrubs is one of the best practices for keeping trees healthy. However, you need to mulch properly for it to truly be beneficial. Never pile mulch against the tree or cover the tree’s root flare, where the trunk flares outward into the ground. Even though a mulch volcano, a large pile of mulch under a tree, is a commonly seen practice, it is not a good one. Mulch volcanoes harm trees!
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The telltale signs of various tree diseases and insect infestations are often most evident in summer. Populations of many types of scales, mites, and aphids are particularly noticeable at this time. Some problems can be spotted and treated immediately. However, when certain insect pests are present and visible, it may already be too late to treat. Even in these cases, learning now that these insects are present is important. You can get a jumpstart on planning for treatments for next year and implement cultural practices, like proper mulching and irrigation, that will keep trees healthier and more resistant to infestation. By regularly looking at your trees you may notice some of the common signs associated with tree pests or disease.
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Being a leader in the tree care industry means continually focusing on learning and innovation. Bartlett’s Tree Topics blog follows in that tradition by offering a place to receive advice on trees, tree pests, tree preservation, and more.
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