Issue no. 8 of the Home, Yard & Garden Newsletter
IN THIS ISSUE:
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Guignardia Leaf Blotch
Guignardia leaf blotch is a fungal disease that affects
many Aesculus species. In Illinois, this
disease is commonly seen on the common horsechestnut (Aesculus hippocastanum). Symptoms begin as rapidly enlarging,
irregularly shaped, water-soaked areas.
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Modified Growing Degree Days (Base 50°F, March 1 through May 15)
Insect development
is temperature dependent. We can use degree days to help predict insect
emergence and activity. Home, Yard, and Garden readers can use the links in this article along with
the degree day accumulations to determine
what insect pests could be active in their area.
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Illinois Invasive
Plant Phenology Report
Several invasive plant experts from around the state have started a new
series of reports focusing on the
phenology of invasive plants in Illinois. The intent of these reports is
to provide an update on the development
of invasive plants across the state of
Illinois -- what plants are in bloom, leafing out, setting seed, or
senescing in different areas of the
state.
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Thousand Cankers
Disease Confirmed in Indiana, Fungus Found on Insect Other than Walnut Twig Beetle
The Indiana Department of
Natural Resource issued a press release on Friday, June 20 announcing
the detection of Thousand Cankers
Disease in Indiana. Indiana joins Maryland, North Carolina, Ohio, Pennsylvania, Tennessee,
Virginia, and eight western states with
the disease.
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Palmer Amaranth -- A New Weed to Watch For
Ask any cotton farmer what has been their biggest
weed problem of recent years and they
will all likely tell you the same:
Palmer amaranth (Amaranthus palmeri).
This plant has put some southern
farmers out of business. Midwest farmers are now or will soon be well acquainted with this fast
growing and yield robbing species as it
is moving northward across the Midwest.
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Japanese Beetle
Japanese beetle
adults are present throughout Illinois. Robert Bellm, Extension Educator, reported their presence in Madison
County, and Ed Nangle, Chicago District
Golf Association, reported their presence in Cook County. Last week in
this newsletter, we predicted low
numbers in the northern half of the state due to the extended deep soil freezing last winter.
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Fall Webworm
Fall webworm is
named for infestations that occur in the northern part of the United States only in late summer to early fall. In
the southern half of the United States,
including the southern half of Illinois, fall webworm has an additional generation in early summer. This first
generation of fall webworm is now
feeding in southern Illinois.
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