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Insects & Disease of Trees
Asian Longhorn Beetle (ALB) Information & Links
Find more information about the Asian Longhorn Beetle and other online resources.
Bagworms eat conifer species of trees and shrubs as their preference then moves to deciduous trees such as sweetgum, maple, hackberry, locust, and elm.
Beech Bark Disease
Beech bark disease (BBD) is a devastating disease of American beech (Fagus grandifolia Ehrl.) caused by a combination of damage to the bark and vascular tissue by the beech scale insect (Cryptococcus fagisuga), followed by infection with several fungal species (Neonectria faginata, Neonectria ditissima, and Bionectria ochroleuca).
Beech Leaf Disease
Beech leaf disease (BLD) was first discovered affecting American beech trees in Lake County in northeastern Ohio in 2012.
Fire Blight of Pears & Apples
Find information and resources pertaining the the Fire Blight diseases that plagues apple and pear trees.
Herbicide Injury (PDF)
Discover how to diagnose and treat herbicide injuries on trees.
Needle Cast on Spruces
Rhizosphaera needle cast causes needles to turn brown, or in the case of the Colorado blue spruce, a purplish-brown, and fall from the tree prematurely.
Oak wilt is a very serious and often deadly disease of oaks, specifically the oaks in the red or black oak group. The actual pathogen (Bretziella fagacearum) that causes the disease has been known to be in Ohio for many decades.
The oystershell scale is one of the most common armored scale insects that cause injury to shade trees and shrubs.
The European spongy moth (formerly gypsy moth; Lymantria dispar dispar) is a non-native, invasive species that has moved into Ohio from Pennsylvania and Michigan over the years.
The spotted lanternfly (Lycorma delicatula) is an insect native to China, India, and Vietnam, and attacks fruit plants, such as grapes and apples, ornamental, and woody trees.
Thousand Cankers Disease
The long-term outlook for eastern black walnuts (Juglans nigra) seemed dire when the Thousand Cankers Disease (TCD) complex was confirmed in Butler County, OH, in 2013. Thankfully, TCD has not followed the devastating trajectory we originally feared.