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Hort in the Home Landscape

A blog devoted to sharing timely horticulture topics and answering the questions of gardeners and homeowners.
Diseases
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White Mold as a Result of Cool, Wet Conditions

Posted by Candice Hart - Diseases

I've noticed several cases of White Mold (Sclerotinia sp.) over the past few days. While at a field day last week, I noted several different annual flowering plants dying as a result of this fungus. And another email today concerning green beans looked like a similar problem. This fungus infects more than 370 species of plants, including many common landscape annuals and perenn...

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tar spot maple

Maple Tar Spot Starting to Appear

Posted by Candice Hart - Diseases

The questions about Maple Tar Spot have started to come in to our local Extension offices, which is a standard occurrence this time of year. Several different fungi in the genus Rhytisma infect the leaves of maples and cause raised, black spots to form on upper leaf surfaces. The diseases are called "tar spots" because their appearance so closely resembles droplets of tar on le...

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Aster Yellow on Purple Coneflowers

Posted by Candice Hart - Diseases

If you're a lover of coneflowers ( Echinacea sp.), then this is your time of year. The coneflowers are blooming beautifully in many gardens across Northern Illinois. Some gardeners have made note though, that their purple coneflowers in particular are looking a little peculiar this season. Some have noted that they are getting very little flowering and the flowers they do have a...

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Fire Blight Photo from U of I Plant Clinic

Fireblight on Pears Common This Year

Posted by Candice Hart - Diseases

We've gotten many calls and samples concerning fire blight this season, and the same goes for our plant clinic on campus in Champaign-Urbana according to their recent report. The majority of the samples submitted to the plant clinic identified fire blight on pear trees and ornamental pear trees. Ornamental pears are popular trees in the Midwest, but they are also susceptible to fire bli...

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Going Beyond Impatiens for the Shade

Posted by Candice Hart - Diseases

Have you noticed less Garden Impatiens ( Impatiens walleriana ), being sold in local garden centers this year? If so, this is due to a recent disease outbreak on impatiens called Downy Mildew of Impatiens ( Plasmopara obducens) . In 2011, the U of I Plant Clinic began receiving reports that downy mildew was a problem in landscapes in the Chicago area. The disease has conti...

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