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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Pest And Disease Center Hemlock Woolly Adelgid Banner 1440X500
Mold or Fungus
Hemlock Woolly Adelgid
Hemlock woolly adelgid (HWA) is a serious pest that is related to aphids. Hemlock woolly adelgids injure hemlocks by sucking sap from needles and twigs.
Pest And Disease Hen Of The Woods Banner 1440X500
Mold or Fungus
Hen Of The Woods Mushroom
The hen of the woods mushroom, or maitake mushroom, is a fungus that is commonly found at the base of oaks and other hardwoods. It is large, dark gray-brown in color, and grows in clusters of fan-shaped, wavy caps.
Pest And Disease Horned And Gouty Oak Galls Banner 1440X500
Growth on Foliage or Branch
Horned & Gouty Oak Galls
There are various species of wasps that may infest oak trees, but two common species include the horned oak gall wasp (Callirhytis cornigera) and the gouty oak gall wasp (Callirhytis quercuspunctata). These pests cause galls, or abnormal plant growths, found on foliage and twigs.
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 Ips Pine Bark Beetle Banner 1440X500
Leaf or Needle Discoloration
Ips Pine Bark Beetles
Several species of IPS bark beetles (also called engraver beetles) primarily attack both pine and spruce trees. Adults are about the size of a dull pencil point and vary in color from brown to black.
Pest And Disease Center Iron Chlorosis Banner 1440X500
Leaf or Needle Discoloration
Iron Chlorosis
Iron chlorosis is a yellowing of plant leaves often caused by iron deficiency that affects many desirable landscape plants in North America. The primary symptom of iron deficiency is interveinal chlorosis, the development of a yellow leaf with a network of dark green veins.
Pest And Disease Iron Deficiency Chlorosis In Turfgrass Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Iron Deficiency Chlorosis In Turfgrass
Iron deficiency chlorosis (IDC) is a condition caused by lack of iron. The disorder can be found in various species of turfgrass, but commonly in St. Augustinegrass. Yellow, blotchy patches form in a lawn after blades turn pale green and eventually bright yellow.
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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