Issue no. 10 of the Home, Yard & Garden Newsletter
IN THIS ISSUE:
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Insect and mite galls are numerous on trees throughout
Illinois this year, as they are in most years. Oaks have the most galls, by
far, with most of their galls being caused by tiny gall wasps in the Family
Cynipidae. Galls are also caused by gall midges (flies), phylloxerans and
psyllids (sucking bugs), and eriophyid mites.
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Insecticide applications rarely provide adequate control
of gall insects and mites. Basic to this is an understanding of how galls form
and their internal structure.
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Emerald ash borer has been found in Champaign, IL along
Market Street, just south of Interstate 74. This is the second infestation
known in Champaign County with it being found in Rantoul a couple of years ago.
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The U of I Plant Clinic has been receiving calls and
samples from clients because their spruce trees are declining and dying. Many
of samples were suspected or found to be infected with Rhizosphaera needle
cast, Stigmina needle blight, environmental problems, and spruce spider
mites. One sample we received consisted
of spruce branches without needles. We
examined the branches, and found no signs of disease.
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When someone suspects that their tree is dying from a
vascular pathogen such as Oak wilt, Dutch elm disease, or
Verticillium wilt, they can send a sample to the U of I
Plant Clinic. We usually suggest that they sample from areas of the trees that
are showing early symptoms typical of disease as well as wood that may show
streaking or darkening of vascular tissue.
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Have you ever let a young plant grow only to later learn
that you shouldn't have? I think many of
us have been guilty of this. Let's go
one step farther. Have you ever
transplanted a mystery plant only to later realize that it was not what you
thought it was? Well I have and I
probably shouldn't admit that openly to the public, but I'm a firm believer in
laughing at yourself and learning from your mistakes.
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