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 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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5504861 LGPT Cedar Needle Blight
Mold or Fungus
Cedar Leaf Blight
Cedar leaf blight is a fungal disease affects western red cedar (Thuja plicata). Severely infected leaves drop in fall.
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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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Shutterstock 1485999227 Plums Monilinia Brown Rot
Mold or Fungus
Monilinia Brown Rot
Brown rot is a common fungal disease that attacks trees with stone fruits. It infects flowers, fruits and branches, sometimes destroying entire crops.
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Pest And Disease Oyster Mushroom Banner 1440X500
Mold or Fungus
Oyster Mushrooms
Oyster mushrooms are very common fungi that are found all over the world. They grow in a flat, broad fan shape and range in colors from white, gray, tan and dark brown. The surface is smooth and the underside shows layers of gills.
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Pest And Disease Pine Wilt Banner 1440X500
Leaf or Needle Discoloration
Pine Wilt Disease
Pine wilt disease is caused by tiny worms called pine wood nematodes and beetles called sawyers that work together resulting in a disease that rapidly discolors and kills pine trees.
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Pest And Disease Center Pink Snow Mold Banner 1440X500
Mold or Fungus
Pink Snow Mold
Pink snow mold is a fungal disease that creates patches of dense, whitish-pink grass blades in winter and spring.
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