Insect & Disease
Resource Center

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 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 Center Euonymus Scale Banner 1440X500
Leaf or Needle Discoloration
Euonymus Scale
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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 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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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.
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Pest And Disease Center Seiridium Canker Of Leyland Cypress Banner 1440X500
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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Pest And Disease Sudden Oak Death Banner 1440X500
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.
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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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