Downy leafspot on hickory (Carya spp.) and walnut (Juglans spp.) is produced by the fungus Pseudomicrostroma juglandis (syn. Microstroma juglandis). The connection to walnut is clearly evident by the fungal pathogen's specific epithet. However, I most often see this disease on hickory growing in deep woods.
More Oddball Leaf Structures: the Hydrangea Leaftier
boggs.47Mon, 06/10/2019 - 10:51
Fern-balls aren't the only oddball leaf structures appearing in Ohio landscapes and forests. The odd looking "leaf-purse" handiwork of caterpillars of the hydrangea leaftier moth (Family Tortricidae; Olethreutes ferriferana) may be found on wild and cultivated hydrangeas.
I received an e-mail message a couple of weeks ago with images showing the tips of ostrich fern (Matteuccia struthiopteris) fronds rolled into tight ball-like structures. One of the images showed a "fern-ball" opened to reveal a translucent caterpillar.
Here is your link to the weekly video update from the OSU Turfgrass Team. Updates are from Dr. David Shetlar, aka The Bug Doc; Dr. David Gardner; Dr. Ed Nangle; Dr. Pamela Sherratt; Joe Rimelspach; Dr. Karl Dannenberger; and Dr. Zane Raudenbush.
Basswood Lace Bug on Silver Linden: Harbingers of the Lace Bug Season
boggs.47Thu, 06/06/2019 - 15:07
I've long admired silver linden with its dark green leaves accentuated by silver undersides. This tough tree is able to handle many of the urban slings and arrows that send less hardy trees to wood chippers. However, this eastern European native seems to be having a growing challenge with our native basswood lace bugs.
First generation scarlet oak sawfly larvae are beginning to skeletonize oak leaves in southwest Ohio. Despite this sawfly's common name, larvae may be found feeding on a wide range of oaks including pin, black, red, and white oaks as well as its namesake oak.