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 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.

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.

Mold or Fungus

Conifer Bark Beetle

Conifer bark beetles are beetles (of varying species) that tunnel just beneath the bark of conifer trees. Bark beetles account for over 90% of insect-related timber losses in the United States.

Leaf or Needle Discoloration

Euonymus Scale

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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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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.

Pest And Disease Center Oak Wilt Banner 1440X500

Mold or Fungus

Oak Wilt Disease

Oak wilt is a vascular disease caused by a fungus that spreads locally from infected trees to nearby healthy trees. Primarily transmitted through root grafts, it causes sudden wilting, early leaf drop, discolored leaves, and sometimes, vascular streaking in the sapwood.

Mold or Fungus

Seiridium Canker Of Leyland Cypress

Seiridium canker of leyland cypress is a fungal disease that produces oozing brown cankers and causes yellowing and browning of tree branches.

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Insect & Disease
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