One More Anthranose: Maple This TIme

In previous BYGLs this spring, we have noted the occurrence of heavy sycamore anthracnose statewide, and also of ash, beech, and oak anthracnose in southwest Ohio. This report from northeast Ohio is of one of the maple anthracnose fungal diseases. I was called out to a landscape in Doylestown Ohio where the homeowners were very concerned that “all of the leaves are fallin’” from a beloved maple tree that towers over their deck. We are all familiar with this sky-is-falling observation which in most cases turns out to be a bit overstated due to worry.

At most, probably less than 1%...

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Jim Chatfield

Elm Galls And More

It is often said that a picture tells a thousand words. In this case, perhaps a few less, but it does tell multiple and layered stories. First, as shown by this image, one of the plant ID characteristics of elm (Ulmus) leaves is the uneven base to the leaf blade as shown here. This was the main point for the attendees at a recent Name That Tree program of OSU Extension at the OSU Mansfield campus. Secondly, of all the gall, the elm cockscomb gall insect (Colopha ulmicola) induced the DNA of this elm leaf to produce a proud new home for the insect’s progeny. Thirdly...

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Jim Chatfield
Joe Boggs

Antlions Are On the Hunt

Ron Wilson (Natorp's) shared an e-mail message with me this morning from a listener of his radio show about a strange insect that kept "trying to cover itself with dirt."  An ID didn't come to my mind … I claim because of a lack of coffee rather than an age-related issue.  Ron chided me by repeating the part about the insect trying to cover itself with dirt.  My last functional neuron fired and I realized the message was about one of our favorite insects:  antions (Myrmeleon immaculatus).

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Joe Boggs
Holey Thistle! boggs.47@osu.edu Tue, 06/07/2016 - 21:38

Damage from the non-native thistle tortoise beetle (Cassida rubiginosa) is beginning to appear on its non-native, invasive host, Canada thistle (Cirsium arvense), in southwest Ohio.  The beetles are pale green or yellowish-green which allows them to blend with their host's leaves.  Like other tortoise beetles, the adults have a body shaped like a flattened pith helmet.  The head and legs of the adults are typically hidden under the flares of their helmet-like body.  The antennae can be hidden or extended out from underneath the front of the beetle.

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Joe Boggs

Who's Spittin' on My Dogwoods?

During today's weekly BYGL Inservice, Amanda Bennett (OSU Extension, Miami County) shared some striking images of the frothy, spittle-like masses produced by dogwood spittlebug (Clastoptera proteus) on its namesake host.  Spittlebug (family Cercopidae) nymphs are responsible for producing the frothy masses; adults of these insects are called "froghoppers" and have an entirely different life style. 

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Joe Boggs

Towering Poison Hemlock

Poison hemlock (Conium maculatum) is among the most deadly plants in North America.  This non-native invasive weed contains highly toxic piperidine alkaloid compounds, including coniine and gamma-coniceine, which cause respiratory failure and death when ingested by mammals.  The roots are more toxic than the leaves and stems; however, all parts of the plant including the seeds should be considered dangerous.  It is a common misconception that poison hemlock sap will cause skin rashes and blisters.  In fact, poison hemlock toxins must be ingested or enter through the eyes, cuts, or...

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Joe Boggs

Calico Scale Crawlers on the Move

Calico scale (Eulecanium cerasorum) 1st instar nymphs (crawlers) have been on the move in southwest Ohio and most have already settled on the undersides of leaves of infested host trees.  The tiny, tannish-brown, oblong-shaped crawlers are around 1/16" in length.  After hatching from eggs beneath females located on stems, the crawlers migrate to the undersides of leaves.  They position themselves along leaf veins where they insert their piercing-sucking mouthparts into phloem vessels to extract amino acids that are dissolved in the sugary plant sap.

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Joe Boggs
Hemlock Pine? chatfield.1@osu.edu Mon, 06/06/2016 - 14:29

We sometimes forget “what it was like not to know”, when it comes to plant identification. Yet, it is essential when it comes to selecting and maintenance of plants. A simple misidentification of a pine vs. a spruce can result in improper pruning timing or improper diagnostics, prognostics, and recommended management for a disease: Diplodia tip blight of pine and Cytospora  canker of spruce are different diseases, obviously on different –plants. And spruces do not have “pine cones”.

 

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Jim Chatfield
Joe Boggs

Trees Take Flight

At a recent tree identification workshop I brought some samples of hedge maple (Acer campestre) and when the learners were keying these out I noted to them that stems had “wings”. Several attendees were more quizzical than usual at my ramblings and asked what I meant. “Wings” or raised or corky projections on stems of woody plants are perhaps most common with regard to winged euonymus (Euonymus alatus) from the Latin alatus which means “having wings or winglike extensions”.

There are many additional woody plant species that have “wings”, though, including...

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Jim Chatfield

Enjoy the Orchid-Like Catalpa Blooms!

I'm an unabashed lover of catalpa trees.  Yes, they are messy, but so are many of our "preferred" native and non-native landscape trees.  I loathe the subjective tree descriptor of "messy" because it removed so many wonderful trees from our landscape palette (e.g. sycamores).

Of course, catalpas do occasionally play host to hungry hordes of their very own caterpillar; catalpa hornworms are the larval form of the catalpa sphinx moth (Ceratomia catalpae).  The caterpillars only feed on catalpa trees.  However, as I discovered with a huge northern catalpa (Catalpa...

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Joe Boggs