Blog Archives

Laurel Wilt Disease: A Threat to Kentucky Sassafras Trees

Laurel wilt is a new disease that was recently detected in southwestern Kentucky. This disease, which is transmitted by the redbay ambrosia beetle, has the potential to rapidly kill sassafras trees. Currently no management options are available for this disease.

Posted in Forest Trees, Landscape Trees & Shrubs

Dogwood Anthracnose Spotted

Anthracnose of dogwood is a common problem in Kentucky. Symptoms on landscape and forest dogwoods often first appear during wet periods in late spring. If left unmanaged, the pathogen spreads, eventually resulting in plant death.  Selection of resistant varieties and

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From Tree Thief to Holiday Tradition: The Story of Mistletoe

Once autumn leaves have fallen, mistletoe becomes highly visible on large trees throughout Kentucky. Phoradendron, the scientific name for Kentucky’s most common type of this parasitic plant, means tree thief. These small leafy plants are commonly found on twigs and

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Sassafras or Yellow Poplar Weevil

Yellow poplar weevil, also known as sassafras weevil, is a small (1/8”), stout, black, snout beetle that can damage yellow poplar, sassafras, and magnolia. In spring, adults can be found on these trees or, when numerous, in buildings and on

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Black Locust Brown?

In some areas of the state, black locust trees have taken on a brown color (Figure 1). This is due to activity of locust leafminer, which results in trees that appear scorched. The adults feed on lower leaf surfaces while

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Dogwood Anthracnose Spotted

Anthracnose of dogwood is a common problem in Kentucky. Symptoms on landscape and forest dogwoods often first appear during wet periods in late spring. If left unmanaged, the pathogen spreads, eventually resulting in plant death.  Selection of resistant varieties and

Posted in Forest Trees, Landscape Trees & Shrubs

Emerald Ash Borers 2018

Since the first discoveries of emerald ash borer in Boone, Jessamine, and Shelby counties in 2009, this invasive insect has spread through normal dispersal flights and the inadvertent movement of infested wood. Tunneling beneath the bark by the larvae (Figure

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Time for Eastern Tent Caterpillar Egg Hatch

After spending about 9 months as eggs in masses on twigs of wild cherry and related trees, the first few tiny eastern tent caterpillars (ETC) of the season should soon be leaving their eggs. The onset of the single generation

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New County Reports of Emerald Ash Borer

Since its discovery in 2009, emerald ash borer (EAB) has continued to invade Kentucky (Figure 1); Cumberland, Green, Taylor, and Wayne counties have been added to the list of counties this year. Designation as “infested” does not mean the insect

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Jumping Oak Gall

Jumping oak galls, made by tiny non-stinging wasps, can cause white oak leaves to turn brown and drop prematurely (Figure 1). The brown to black spots on leaves are discolorations that galls create on upper leaf surfaces. Tiny button-shaped galls

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Emerald Ash Borer Detections and Treatment Horizon

Abe Nielsen, Kentucky Division of Forestry Forest Health Specialist, reported first detections of emerald ash borer infested trees at locations in Clinton, Cumberland, and Wayne counties. The map (Figure 1) shows the extent of the known infestation. Is Preventive Treatment

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Recognizing the “In-line Borer”

One of the more curious signs on a tree is one or more rows of regular, shallow holes on the trunk. Usually, this is the work of the yellow-bellied sapsucker, a member of the woodpecker family. The sap that wells

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Emerald Ash Borer Outlook for 2017

Since its discovery in 2009, the emerald ash borer (EAB) has spread dramatically (Figure 1) within the Commonwealth. This spread will continue through short-range dispersal flights of the insect and long distance transport of infested wood, primarily firewood. Naturally, those

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Sawflies- Late Season Pine Defoliators

Sawflies are members of the insect order Hymenoptera that includes ants, bees, and wasps. The larval stage has a caterpillar-like body that may be brightly marked with stripes or spots. Some species change significantly in appearance as they grow, making

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Fall Webworm – Generation II

The second generation of fall webworm is underway and their distinctive silk nests should be abundant in many areas through August. These fuzzy caterpillars have pale green or yellow hairs over their bodies with rows of black spots along their

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