Articles

Observations: Socrates, Poison Hemlock, Fennel Aphids, and Multicolored Asian Lady Beetles

Poison hemlock (Conium maculatum, family Apiaceae) is one of the deadliest 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. So, how can fennel aphids survive sucking juices from the plant that killed Socrates and how can lady beetles survive eating the aphids?
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Authors
Joe Boggs

Sycamore Anthracnose Symptoms Fade

  This morning I got a message from Frank Leon, horticulturist with Barnes Nursery, complete with the above image showing the thinning of sycamore (American planetree; Platanus occidentalis), a common sight seen in northwest Ohio this Spring. The problem is sycamore anthracnose, caused by the fungus Apiognomonia veneta.

 

 

  This particular anthracnose fungus occurs on planetrees, including our native sycamore, but less so on Platanus orientalis and the hybrid between these two planetrees, Londone planetree (PlatanusX acerifolia...

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Authors
Jim Chatfield

Slug Sawfly on American Bladdernut

In 2015, I reported that I had found sawfly larvae skeletonizing American bladdernut (Staphylea trifolia) leaves in southwest Ohio (see BYGL Bug Bytes, September 3, 2015, “Scarlet Oak Sawfly on Bladdernut?”). The title of that report was based on the appearance of the larvae: they were the spitting image of Scarlet Oak Sawfly (Caliroa quercuscoccineae) which is sometimes called the scarlet oak slug sawfly or just oak slug sawfly.
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Authors
Joe Boggs

Elongate Hemlock Scale Alert

I revisited a Cilician fir (Abies cilicica) earlier this week in southwest Ohio that I found to be heavily infested with Elongate Hemlock Scale (EHS) (Fiorinia externa) in 2010. I’ve been monitoring this tree since that time and have watched the scale population rise and fall then rise again; the tree has never been treated.
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Authors
Joe Boggs

Why Trees Matter Forum; October 18

Trees matter in many ways; just ask the Ents. Their beauty and grace is wondrous, they are proven healers for hospital patients, their social importance as historical references is well-known, from Johnny Appleseed to the Signal Tree in Summit County, and their environmental services, well…

 

  Check out treebenefits.com and itreetools.org for itemization of the economic benefits of the environmental services of trees: Storm water remediation, energy savings, air quality improvement, carbon effects, property values.

 

  With that in mind, in past years we...

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Authors
Jim Chatfield

The Return of an “Old Southern Friend”

Julie Crook and I spent a lovely afternoon yesterday “cruising” the Cincinnati Botanical Garden and zoo with Steve Foltz (Director of Horticulture) looking at their impressive plant displays and working with Steve on with some diagnostics. During our walk-about, Steve pointed out an “old friend” scurrying beneath a goldenrain tree (Koelreuteria paniculata; Soapberry Family, Sapindaceae): a Goldenrain Tree Bug (Jadera haematoloma).
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Authors
Joe Boggs
Yellow Polka Dotted... Tomatoes?? draper.15 Tue, 06/27/2017 - 20:16

I was called out to visit a high tunnel vegetable grower, who was concerned about what he was seeing on tomato leaves, which he hadn’t seen before on the plants.  He told me that spots had suddenly began to appear on his tomato plants, and that he really didn’t want to lose the plants or the huge crop of tomatoes that the plants had set.

 

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Authors
Erik Draper

Basswood Leaf Miner Damage Can Be Alarming

What begins as minor feeding injury on the leaves of basswood (Tilia spp.), can quickly become an attention grabber, especially if you are unfamiliar with the insect and the injury caused. The leaves appear to be torched and stand out among other trees in the area. The damage is obvious even as you are traveling on highways - at the recommended speeds of course

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Authors
Amy Stone
Joe Boggs
Curtis E. Young