I recently came across odd leafmining activity on wild grape (Vitis spp.) growing in a local park in southwest Ohio. The leafmines were serpentine, named for their snake-like appearance, and they were filled with a dark line of excrement (frass). The leafmines ended in elongated expansions where the leafminer was no doubt pupating.

The malpractice of piling mulch high on tree stems to approximate the look of a volcano is well underway in Ohio. This horticultural horror, commonly known as a “mulch volcano” or “volcano mulch,” produces a range of detrimental effects, including reshaping tree root systems and interfering with water infiltration and retention.

Turf Team Times for May 15, 2026: Dr. Ed Nangle and Dr. David Garner discuss the weather shift and spring turf considerations. Dr. Gardner discusses weed control including crabgrass, rough bluegrass and creeping bentgrass, and broadleaf helleborine.

Leafminers are so named because they tunnel between the upper and lower epidermis to feed on the leaf mesophyll. Leafmining is a lifestyle with no connection to taxonomy. This Alert focuses on two leafminers belonging to the insect order Diptera (flies).

Bagworms are the larvae (caterpillars) of a native moth. The caterpillars develop within silk bags festooned with pieces of their host plants. As the caterpillars mature, they begin weaving more host plant debris into the silk, which provides structural stability as well as highly effective camouflage.

On a recent visit to the doctor, I noticed trees in the parking lot at various stages of decline and death. It is a nice thought to plant trees in parking lot islands, but it usually ends poorly, especially for the tree!

Participants in the OGIA/OSU Extension Diagnostic Walkabout held this past Monday in Cincinnati Parks’ T. M. Berry International Friendship Park observed the handiwork of our native Hydrangea Leaftier Moth caterpillars. The moth’s caterpillars appear to feed exclusively on our native Smooth Hydrangea, as well as varieties and cultivars.

A recent cold snap brought frost to many parts of Ohio. Some trees, especially those with new tender leaves were more heavily impacted than others.