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 implies, the pathogen is specific to members of the Fraxinus genus.
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 States from Europe. Although the sawfly prefers sugar maples (Acer saccharum), other maples may occasionally be infested.
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 been considered relatively free of serious insect pest and disease problems. Unfortunately, beech bark disease and the enigmatic beech leaf disease are changing that perception.
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, dingy patina owing to black sooty molds colonizing honeydew in the past indicating the problem was not new.
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 you do. Inspect your plants and report what you find.
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 it? If you are concerned about the health of your lawn, there’s potentially some downsides to ‘No Mow May’.
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, concrete retaining walls, outside walls of homes and buildings, park benches, etc.
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 local park had noticeable damage on a substantial number of their leaves.