Insect & Disease
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Signs of pests and diseases will vary from tree to tree. Search our database of pests and diseases for symptoms, damages, life cycle, management, and control information.

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Damage & Symptoms
Pest And Disease Algal Leaf Spot Banner 1440X500
Spotting on Leaf
Algal Leaf Spot Of Magnolia
Raised, wavy, cushion-like spots are symptoms of algal leaf spot, also known as green scurf. The spots are greenish, pinkish or grayish and less than 1 cm. in diameter. They may encircle a twig, creating a girdling canker.
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Pest And Disease Hypoxylon Canker Of Oaks Banner 1440X500
Mold or Fungus
Biscogniauxia Canker Of Oaks
Pronounced bisk-o-nee-ox-e-a, this fungus can be identified by the dark-colored, crusty fungus tissue on dead, cankered areas. Light-colored spore masses are frequently seen on branches and stems of severely affected trees. Large pieces of bark may slough off, exposing the fungus underneath.
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Pest And Disease Btb Tunneling Banner 1440X500
Sawdust on Trunk
Black Twig Borer
Black Twig Borers are a species of the ambrosia beetle group that are small, round and dark brown/black in appearance.
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Pest And Disease Brittle Cinder Fungus Banner 1440X500
Trunk or Bark Damage
Brittle Cinder Fungus
Brittle cinder fungus, or Kretzschmaria deusta, is a fungal pathogen that causes breakage in seemingly healthy trees. The fungus appears around the base of trees as a crust-like fruiting body that has wavy edges.
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Pest And Disease Slime Flux Banner 1440X500
Substance on Leaf or Oozing
Bacterial Wetwood & Slime Flux
Bacterial wetwood is a bacterial infection that causes a profuse flow (flux) of sap from trunk wounds or pruning cuts.
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Pest And Disease Center Euonymus Scale Banner 1440X500
Leaf or Needle Discoloration
Euonymus Scale
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Fusarium Len Burkhart AD Lt
Wilted or Curled Leaves
Fusarium Wilt Of Palms
Fusarium wilt of palms is caused by a fungus that blocks the vascular tissue (xylem), which transports water and nutrients. There is no cure, so infected trees eventually die.
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Pest And Disease Center Japanese Beetle Control On Woody Banner 1440X500
Holes or Skeletonization in Leaves
Japanese Beetle Control On Woody Ornamentals
Japanese beetles are pests in the U.S. found primarily east of the Mississippi, but are rapidly spreading westward. Adults are 3/8”-1/2” long with metallic green bodies and copper/bronze wings.
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