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 Western Tussock Moth Banner 1440X500
Holes or Skeletonization in Leaves
Western Tussock Moth
The western tussock moth is considered a pest and commonly found on the Pacific coast from southern California up to British Columbia.
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5475315 SMPT Lethal Bronzing Palm1
Dieback or Thinning Canopy
Lethal Bronzing Of Palms
Formerly called Texas Phoenix Palm Decline, lethal bronzing of palms is a disease caused by a phytoplasma, which is a bacterium-like organism. Once symptoms appear, infected trees die.
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Pest And Disease Bacterial Leaf Scorch Banner 1440X500
Leaf or Needle Dropping
Bacterial Leaf Scorch
Bacterial leaf scorch, also known as Marginal leaf burn, is a chronic and systemic disease mostly affecting oaks and maples.
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Pest And Disease Black Vine Weevil Banner 1440X500
Holes or Skeletonization in Leaves
Black Vine Weevil
The black vine weevil is a destructive insect that kills host plants by feeding on their foliage. Larvae are white, C-shaped grubs that feed on plant roots and bark cambium, resulting in yellowing and wilting of foliage, and plant death.
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Pest And Disease Center Gray Snow Moldt Banner 1440X500
Mold or Fungus
Gray Snow Mold
Gray snow mold is a fungal disease that attacks turfgrass in areas where there are extended periods of snow cover. It is easier to manage if treated in a timely manner but can be fatal to turfgrass if left untreated.
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Pest And Disease Center Pine Sawfly Banner 1440X500
Leaf or Needle Discoloration
Pine Sawfly
Pine sawflies are conifer-feeding insects. They are categorized into two groups: spring species and summer species. Both feed on pine needles, causing the needles to turn yellow or brown. Sometimes the needles are completely consumed.
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Pest And Disease Sod Webworm Banner 1440X5800
Webs or Bags
Sod Webworms
Sod webworms are grayish-green caterpillars with dark brown heads and brown spots along the length of their bodies. The caterpillars live in silken tunnels at the base of grass blades, feeding on the grass blades at night and hiding in their tunnels during the day.
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Fusiform Rust Photo Arborist Advice Banner
Mold or Fungus
Southern Fusiform Rust
Southern fusiform rust is a fungal pathogen that causes trunk and/or branch swelling in pine hosts and rust on oak leaves.
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