Issue no. 15 of the Home, Yard & Garden Newsletter is now available
IN THIS ISSUE:
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The hot, dry summer has apparently been responsible for
higher levels of West Nile virus earlier this year in Illinois. The virus is
reaching levels about a month earlier than is typical. As it normally builds
from mid-August through the fall, this early increase followed by human cases
makes it likely that its impact will be much higher than recent years. This
increased level makes it important to protect landscape workers and others
involved in outdoor activities.
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European paper wasp, Polistes diminula, has been
identified in Urbana in central Illinois. This wasp has been in northern
Illinois for several years. In North America, it is found in southern Canada
and the northern U.S., being common in Ontario, Michigan, Ohio, and Wisconsin.
It has not been found south of southern Virginia. In the eastern hemisphere, it
is native to southern Europe and Asia and northern Africa. It will surely
continue to spread farther south in the U.S.
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This week, the U of I Plant Clinic has confirmed downy
mildew of impatiens (Impatiens walleriana) in Cook County. It is apparent that the recent rains and
cooler night temperatures provided the perfect environment for disease
infection. Earlier this year, in HYG
issue #3 I warned readers to watch out for this unbelievably destructive
disease.
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Bleeding Canker is a potentially lethal disease to mature
European Beech trees (Fagus sylvatica). Researchers at Cornell University have
been working extensively with this disease and have identified three closely
related species of Phytophthora that are involved. Phytophthora plurivora, P.
pini and P. citricola all cause similar bleeding canker symptoms.
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