Invasive Forest Pests of Concern to Indiana
Asian Longhorned Beetle (ALB)
A menace in its native China, ALB can kill 13 different groups of trees. Adults are large black beetles about an inch long, with random white spots, long striped antennae, and sometimes blue feet.

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Presence in Indiana: Not Detected

Trees Attacked: Maples, Elms, Willows, Horsechestnut, Birches, Poplars, and others
Emerald Ash Borer (EAB)
This tiny beetle from Asia is a death sentence for American ash trees. Easily spread in firewood, this pest has now been found in 16 states and two Canadian provinces.

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Presence in Indiana: Widespread

Trees Attacked: Ashes
Gold Spotted Oak Borer (GSOB)
A relative of EAB, GSOB tunnels beneath the bark of oak trees, cutting off the flow of nutrients. It has killed over 80,000 oaks in southern California, and is easily moved in oak firewood.

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Presence in Indiana: Not Detected

Trees Attacked: Oaks
Gypsy Moth (GM)
Voracious gypsy moth caterpillars can completely defoliate entire trees and create unsavory conditions for outdoor recreation. Repeated defoliations can weaken and kill even healthy trees.

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Presence in Indiana: Present

Trees Attacked: Over 500 host species, oaks and aspens preferred
Hemlock Woolly Adelgid (HWA)
This tiny sap-sucking insect feeds at the base of hemlock needles, causing defoliation and tree death. It is spread naturally by wind and birds, but is moved long distances on horticultural plantings and firewood.

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Presence in Indiana: Not Detected

Trees Attacked: Hemlocks
Sudden Oak Death (SOD)
Large numbers of coast live oaks and tanoaks in coastal California and Oregon are dying from stem cankers caused by Phytophthora ramorum, a fungus-like organism of unknown origin.

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Presence in Indiana: Not Detected

Trees Attacked: Oaks
Thousand Cankers Disease (TCD)
Caused by a minute beetle carrying a canker-causing fungus, TCD has destroyed many urban black walnut plantings in the west. Thought to have been brought east in woodworking material, it has recently been found in TN, PA, and VA.

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Presence in Indiana: Not Detected

Trees Attacked: Black walnut, butternut
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