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
Armyworms Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Fall Armyworms
Fall armyworm caterpillars eat the leaves and stems of turfgrasses, but typically do not destroy the crown of the plant. Early feeding damage can resemble drought stressed turf, but can quickly progress to complete browning of the entire stand when caterpillars are present in large numbers.
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Pest And Disease Algal Leaf Spot Banner 1440X500
Spotting on Leaf
Algal Leaf Spot Of Magnolia
Raised, wavy, cushion-like spots are symptoms of algal leaf spot, also known as green scurf. The spots are greenish, pinkish or grayish and less than 1 cm. in diameter. They may encircle a twig, creating a girdling canker.
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Pest And Disease Center Anthracnose Disease Of Deciduous Trees Banner 1440X500
Mold or Fungus
Anthracnose Disease Of Deciduous Trees
Anthracnose is a common and destructive group of fungal pathogens that attack various shade trees.
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Pest And Disease Aphids Banner 1440X500
Mold or Fungus
Aphids
Aphids, sometimes called plant lice, are soft-bodied, sucking insects. They tend to cluster in large colonies on new growth and come in a variety of species that may be green, black, red, orange, wooly, spotted or bow-legged.
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Pest And Disease Apple Scab Banner 1440X500
Leaf or Needle Discoloration
Apple Scab
Apple scab is a foliar leaf disease caused by the fungus Venturia inaequalis.
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Pest And Disease Leafminer Banner 1440X500
Leaf or Needle Discoloration
Arborvitae Leafminer
Arborvitae or cedar leafminers are larvae of small, silver and tan moths. The larvae are small, brownish-black caterpillars that burrow into the leaves of plants.
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Pest And Disease Armillaria Mushrooms Banner 1440X500
Mold or Fungus
Armillaria Root Rot
Armillaria root rot, also known as ‘honey fungus’ or ‘shoestring root rot’, is a group of decay fungi comprised of at least 11 species. It affects both landscape and natural habitat plants throughout the United States.
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Pest And Disease Ash Flower Gall Mite Banner 1440X500
Bumps or Blisters on Leaf or Needle
Ash Flower Gall
Ash flower gall is a symptom of feeding activity of microscopic mites known as ash flower gall mites.
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