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

Bumps or Blisters on Leaf or Needle

Peach Leaf Curl

Peach leaf curl is a disease that primarily targets peach trees just before or after bud break in the spring. Infected tree leaves will turn red, form blisters and wilt.

Red Imported Fire Ant

The red imported fire ant is an invasive species that inhabits lawns, pastures, fields and roadsides to create lumpy soil mounds. They are known to sting people and animals which can be quite painful.

Pest And Disease Twig Girdler And Twig Pruner Banner 1440X500

Dieback or Thinning Canopy

Twig Girdler & Twig Pruner

Twig girdlers and twig pruners are beetles that attack the twigs of trees. They lay eggs at the ends of branches and cut off the tips of the branch, allowing the larvae to feed on and pupate inside the twigs.

Webs or Bags

Zimmerman Pine Moth

Zimmerman pine moths are 5/8” long with gray wings marked with mottled red and gray. Once a year, their larvae hatch and tunnel into trees, interfering with the tree’s sap flow and weakening them. Eventually, wind may break the weakened tops.

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.

Webs or Bags

Bark Lice

Bark Lice are small, dark-colored insects that produce fine, dense webbing on the trunks of host trees. Varying in color from tan to black, these pests may or may not have wings, and are usually less than five millimeters long.

Leaf or Needle Discoloration

Boxwood Decline

Boxwood decline is a condition that causes weak growth, discoloring of leaves and branch dieback in boxwood shrubs. This condition usually involves several factors, including poor planting conditions and improper cultural practices, as well as stem and root diseases.

Mold or Fungus

Cytospora Canker

The plant pathogenic fungus Leucostoma kunzei (formerly Valsa kunzei) is the causal agent of cytospora canker, a disease of some conifers found in the Northern Hemisphere, predominantly on Norway spruce (Picea abies) and Colorado blue spruce (Picea pungens).

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