Tree Insects and Diseases

Homeowners should be vigilant and inspect their trees and shrubs periodically for early signs of insect and disease infestations. Branches Tree Experts can help you with identification and potential treatment options. A quick response can prevent the spread of pathogens and keep damage to a minimum, along with lessening treatment costs. Remember health trees and shrubs add to your property’s value, in addition to improving environmental and aesthetic quality.

Maryland Extension Insect and Disease Reports PDF

Common Tree Insects:

Common Tree Diseases:

Azalea Lace Bug

azalea_laceA native insect that damages a wide variety of trees and shrubs, particularly cedar, juniper and arborvitae. Adult moths are 3/4″ inch long and black. The larvae are enclosed in silken bags, 1-2″ in length, and covered with plant parts. (Late Spring

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Bagworm

bagwormA native insect that damages a wide variety of trees and shrubs, particularly cedar, juniper and arborvitae. Adult moths are 3/4″ inch long and black. The larvae are enclosed in silken bags, 1-2″ in length, and covered with plant parts. (Late Spring

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Bark Beetles

barkbeetleMost pines and spruces grown under stressed conditions are susceptible to attack. The three common Ips species each attack different tree parts, that is, branches, upper trunk, and lower trunk.

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Black Vine Weevil

blackvineweevilImported insect that feeds on roots and foliage(leaf margin notching) of broad-leaved evergreens, preferably Azaleas, Yews and Rhododendron. Adults are 3/8″ long, black weevils with faint yellow flecks. (Late Spring)

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Boxwood Psyllid

psyllid (1)Insect that feeds on American boxwood, causing terminal leaves to be cupped and stunted. Adults are about 1/8″ inch long and resemble tiny cicadas. Insects usually found inside cupped terminal leaves.

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Hemlock Woolly Adelgid

woollyImported pest often kills eastern or Canadian hemlock by feeding on needles and subsequent needle drop. Adult females are conspicuous because of white fluffy wax covering on twigs.(Early Spring-Fall).

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Spider Mites

spidermitesMany types of spider mites infest both deciduous and evergreen landscape plants and are not readily visible without magnification. Look for early signs of stippling on needles and leaves, along with general discoloration.

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Eastern Tent Caterpillar

caterpillarThis moth larvae feeds on a number of plant species, but prefers wild cherry and ornamental fruit trees. Caterpillars have one stripe down back and construct silken webs in branch forks. (Mid-Late Spring)

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Dogwood Anthracnose

anthraxnoseThis is a fungal disease that slowly progresses from a foliar to a systemic infection and proves fatal to native dogwood species. Symptoms include brown nectoric areas along mid-veins, leaves held through winter, and water sprouts. Advanced signs include die-back and tree decline.

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Apple Scab

applescabApple scab is a fungal disease that attacks the foliage of apple trees and related species. Leaves exhibit brown necrotic areas that gradually enlarge and cause premature leaf drop, defoliating a large portion of canopy. Repeated infections lead to a general weakening of tree.

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Botryosphaeria Canker

bcankerThis is a systemic fungal disease that infects a wide variety of trees and shrubs and causes visible cankers and limb die-back.

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Seiridium Canker

scankerThis systemic fungal disease is most often seen on the Leyland Cypress. Infected trees exhibit spots of exuding sap along trunk. Advanced signs include individual branch die-back and tree decline.

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Bacterial Leaf Scorch

scorchLook for: Elm leaf margins exhibit browning and yellow halo.

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Root Rot and Butt Rot Fungus

rotfungusA number of fungi actively attack trees and can cause structural failure

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