Issue no. 3 of the Home, Yard & Garden Newsletter in now available
IN THIS ISSUE:
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The weather over the last week has varied in its effect
on insect development throughout the state. Insect development is generally
governed by a base temperature of about 50 degrees F. Based on growing degree
days with a base temperature of 50 degrees F, southern Illinois is about two
and one-half weeks ahead of the historical average and central Illinois is two
weeks early. Northern Illinois is about one and one-half weeks early.
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Emerald ash borer, Bagworm, and Silverleaf Whitefly are
discussed.
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Large numbers of eastern flower thrips, Frankliniella
tritici, are present in central Illinois. This insect primarily overwinters in
the southern U.S. and typically migrates into Illinois in the spring. They are
major pests of greenhouses and outdoor flowers. These thrips cause severe
distortion of the berries of strawberry.
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In October, 2011, there were several reports of impatiens
downy mildew (IDM) on garden impatiens (Impatiens walleriana). This disease was first reported in the U.S.
in 1942, but late last season was confirmed on impatiens in coastal southern
California, northeastern Illinois, northern Indiana, Cape Cod in Massachusetts,
Long Island and upstate New York.
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There is certainly no shortage of chickweed in Illinois
this spring. The mild winter and warm
conditions early on have likely led to the increased populations we are
seeing. Common chickweed (Stellaria
media) is a cool-season annual (also known as a winter annual) member of the
Pink family (Caryophyllaceae) that reproduces by seeds.
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The plant clinic has received a couple of Spruce samples
that were found to be infected with Spruce Needle Rust (Chrysomyxa spp.).
Several species of fungi belonging to the genus Chrysomyxa are known to cause
rust on spruce. Most Chrysomyxa species are heteroecious and require more than
one host to complete their life cycles.
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