Issue no. 12 of the Home, Yard & Garden Newsletter
IN THIS ISSUE:
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We've been getting calls about flying lint and tiny
drifting angels from throughout the state. These are the winged adults of
woolly aphids appearing as a white fuzzy, close to ¼ inch in diameter, which
seems to float through the air. If you try to catch one, you soon realize that
it is capable of powered flight. These aphids are green to blue and covered
with white waxy strands that stand out from the body.
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Pest of hollyhock, including hollyhock weevils and
hollyhock plant bugs, are discussed.
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Genista caterpillar, Uresiphita reversalis, is common
this year on wild indigo, Baptisia. The caterpillars web the leaves together
with silk, eat holes in the leaves, and eat leaf margins to the midvein. There
are two generations per year. This is probably the second generation as we had
some reports in early June.
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We have been receiving reports of high numbers of sod
webworms throughout the state. Sod webworm caterpillars are more common in
nonirrigated turf in Illinois during seasons of drought. The larvae are very
susceptible to microsporidia disease, particularly under cool, damp conditions.
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Scorch may be of the noninfectious or infectious type.
Environmental stress, root injury, drought, and many other factors may cause
leaf margin necrosis, a condition we call scorch. It is usually widespread in a
tree and is fairly uniform. Such a condition is not necessarily repeated in
following years and is noninfectious. Unfortunately, we are seeing a lot of
scorch symptoms on leaves brought on by this season's environmental stress.
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Several fungal pathogens are known to cause wilt and
dieback on rhododendrons. Phytophthora Dieback and Phytophthora Root Rot are
often our first suspects when diagnosing in the field. Phytophthora dieback usually appears during
flushes of new growth. The disease causes individual shoots and leaves of new
growth to wilt and curl inward.
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The tomato is one of the more popular vegetable grown in
home gardens. With it, however, come a plethora of problems and this season has
no shortage. A number of the problems that gardeners may be seeing are
discussed.
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Is my lawn dead? I
hear that question every year, but particularly this summer. The good news is that turfgrasses have an
excellent dormancy mechanism that allows them to tolerate most droughts. The bad news is that there is no way to
visually tell whether grass is dead or just dormant.
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