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).

Dusky Birch Sawfly and Spiny Oak Sawfly larvae are appearing on their namesake hosts in southwest Ohio. They seldom cause significant injury to the overall health of their host trees; however, both can produce noticeable damage, drawing the attention of horticulture professionals and home gardeners.

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.

The OGIA/OSU Extension Hands-On Diagnostic Walkabouts for Green Industry professionals are a comprehensive, hands-on training. Participants examine and discuss plants, plant pests, plant diseases, landscape designs, and other points of interest.

“Bleached” leaves are appearing on landscape roses in southwest Ohio. Unfortunately, I only need to walk to the end of my driveway to see the damage on ‘Knock Out’ roses.

April was an active month at the C. Wayne Ellett Plant and Pest Diagnostic Clinic, with a wide range of plant health issues observed across ornamentals, fruits, vegetables, and cut flowers. Conifer samples were especially common, alongside recurring pest issues on boxwood. We also diagnosed several fungal and bacterial diseases in fruit and vegetable crops, as well as mite and bacterial problems in cut flowers.