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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 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...
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...
Hatch of Spotted Lanternfly Observed in Cincinnati
MAY 18, 2023
On Thursday, May 4, 2023, Jonathon Shields, Agriculture Inspection Manager with the Ohio Department of Agriculture (ODA), confirmed hatch of spotted lanternfly (SLF) within the Cincinnati infestatio...
Sticky, Dripping Maples
MAY 3, 2023
Late last week, I came across plantings of red maples (Acer rubrum) in a commercial landscape in southwest Ohio that were dripping sticky, sugary, honeydew; the calling card of phloem-sucking insect...
I recently sent boxwood samples to The Ohio State University Plant and Pest Diagnostic Clinic. The results came back with the following comments:
After incubation in moist chamber, we observed Volute...
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Bad Looking Boxwoods
MAR 22, 2023
Boxwood leafminer damage is already becoming apparent. However, the symptoms are highly variable and may be mistaken for winter injury, a “leaf blotch” disease, or something else. Birds seeking meat...
It’s that scaly time of the year…
FEB 20, 2023
In winter site inspections, we are finding a lot of Japanese maple scale on a lot of different plants, many you may not expect. This is a blue holly loaded with Japanese maple scale.
