Guignardia Leaf Blotch of Aesculus is a fungal disease that is commonly observed on buckeyes and horsechestnuts in Ohio at this time of the year. However, don’t leap to the conclusion that all leaf blotches are symptomatic of this disease.

The June 3 Diagnostic Walkabout at the Mt. Airy Arboretum for Green Industry professionals is a comprehensive, hands-on training. Participants look at plants, plant pests, plant diseases, landscape designs, and other points of interest.

BYGLers reported during yesterday’s Tuesday morning BYGL Zoom Inservice that overwintered Bagworm eggs are hatching or have hatched in Ohio meaning the “bagworm season” is now underway. Look closely at trees and shrubs festooned with last season’s bag abodes to detect newly hatched bagworms.

White, rounded, woolly-looking galls are appearing on oaks throughout Ohio. They are the Wool Sower Gall and are produced under the direction of the gall wasp, Callirhytis seminator (family Cynipidae).

Check out the latest edition of the Turfgrass Team Times.

The “tHRIve - WEB SERIES” is where you can remain updated on a wide range of issues important to the Green Industry.  The webinar titled, “Box Tree Moth Demystified” was presented live last Wednesday, May 15.  The webinar covers what to look for with BTM and the latest results from BTM management trials.

This beetle is widespread in the temperate parts of the world, including the Palearctic, Afrotropical, Australian, Nearactic, and Neotropical regions. In the United States, wharf borer is widespread in eastern and western coastal areas and the Great Lakes region.

USDA Animal and Plant Health Inspection Service (APHIS) released a Federal Order yesterday providing new information on the expansion of quarantines for the Box Tree Moth (BTM) (Cydalima perspectalis, family Crambidae). The Order also noted that conditions for interstate movement of regulated articles have been established.

Poison Hemlock (Conium maculatum) and Wild Parsnip (Pastinaca sativa) have reached developmental stages that place these weeds outside of effective management options in southwest Ohio. Wild parsnip is producing seeds while poison hemlock is in full bloom meaning seeds can still develop on plants that are cut or sprayed with an herbicide.