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Is Emerald Ash Borer on the Rebound in Ohio?
JUN 15, 2023
The lead image for this Alert of an Emerald Ash Borer (EAB) (Agrilus planipennis, family Buprestidae) adult was taken on June 1, 2023, in Butler County, OH. According to our Ohio State Phenology Cal...
Leaflet Drop on Ash
MAY 18, 2023
Native ash trees in southwest Ohio are showing tell-tale symptoms of Ash Anthracnose. The disease is produced by the fungus, Plagiostoma fraxini (syn. Gnomoniella fraxini). As the specific epithet i...
Leaf Drop on Sugar Maple
MAY 18, 2023
The leaf-shedding handiwork of the Maple Petiole Borer (Caulocampus acericaulis, family Tenthredinidae) is becoming evident in southwest Ohio. This non-native sawfly was introduced into the United S...
Sticky, Dripping European Beech
MAY 18, 2023
I’m a fan of beech (Fagus spp., family Fagaceae) from American beech (F. grandifolia) to European beech (F. sylvatica) to beechwood-aged potations (F. beerlignumia). Members of the genus have long b...
Sticky, Dripping Oaks and Ghost Scales
MAY 18, 2023
I recently visited a commercial landscape that had 5” – 6” DBH bur oaks (Quercus macrocarpa) with their newly expanding leaves speckled with clear, sticky honeydew. Twigs and branches had a dark, di...
ODNR recently held a workshop in Spring of 2023 on Hemlock Wooly Adelgid(HWA) and Elongate Hemlock Scale(EHL) at Penitentiary Glenn in Like County. So as a horticulturist or homeowner, what should y...
Oak Apples, Woolly Catkins, and Leaf Blisters
MAY 18, 2023
Oak Apples, Woolly Catkins, and Leaf Blisters are appearing on oaks belonging to the red oak group in Ohio. While the galls may be very apparent, they cause no appreciable harm to their oak hosts.
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Lawns are greening up and growing like crazy. You may be tempted to employ the technique titled ‘No Mow May’. But what’s wrong with letting your lawn grow for the whole month of May without cutting ...
“Concrete†Mites: A Threat to White Clothing
MAY 18, 2023
So-called “concrete mites” are making their annual appearance in southwest Ohio. These tiny, fast-moving bright red mites scurry around on sunny surfaces such as picnic tables, patios, sidewalks, co...
Heavy Hawthorn Leafminer Damage
MAY 18, 2023
Damage by the Hawthorn Leafminer Sawfly (Profenusa canadensis, family Tenthredinidae) on its namesake host is becoming evident in southwest Ohio. Several small hawthorn trees I saw yesterday in a lo...
