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

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

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.

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.

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.

Dieback or Thinning Canopy

Sudden Oak Death

Sudden Oak Death (SOD) is caused by a water mold called Phytophthora ramorum. The disease is common throughout California and Oregon.

Pest And Disease Ash Rust Banner 1440X500

Spotting on Leaf

Ash Leaf Rust

Ash leaf rust can be a significant problem in the Mid-Atlantic area and along the New England coast. Leaves, petioles and green twigs become infected during May and June. When the infection is severe, premature defoliation can occur.

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Insect & Disease
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