Issue no. 4 of the Home, Yard & Garden Newsletter
http://hyg.ipm.illinois.edu/article.php?id=359
IN THIS ISSUE:
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The weather over the last week was close to normal for
this time of year, except that northern Illinois was slightly cooler.
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Emerald ash borer was found in three new counties from
last fall into this spring. These include rural Farmer City in DeWitt County in
September, in Fairbury and at the rest area near Pontiac in Livingston County
in February, and in northern Decatur in Macon County in April. The Decatur location is near rail lines.
Emerald ash borer adults have emerged throughout the state.
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Hydrangea leaftier, Olethreutes ferriferana, has been
noticeable in northeastern Illinois and is present in other areas of the state.
Damage appears as three or four cupped leaves tied together with silk at the
end of a branch at the top of the plant. An attacked plant will typically have
ten to twenty of these cupped leaf sets. Pulling the leaves apart reveals a
slender greenish caterpillar up to one-half inch long with a blackish head.
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The Indiana Department of Natural Resources recently
announced that the hemlock woolly Adelgid was identified in the state for the
first time. This invasive insect was found on a landscape tree in LaPorte
County in mid-April.
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Many sycamores are infected with anthracnose in Illinois
every spring; however, the intensity and duration of infection is dependent on
the weather. Most Anthracnose diseases
thrive during cool and wet conditions. In addition, dry winters may stress
trees, which can make trees more susceptible to disease.
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This spring, many Callery pears in Illinois are showing
symptoms of Bacterial blight, a disease caused by Pseudomonas syringe. This is
a weak pathogen known to infect many species of ornamentals, especially when
the plants are under stress. Like many bacterial pathogens, it requires a wound
or natural opening to enter the plant.
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