Issue no. 7 of the Home, Yard & Garden Newsletter is now available
http://hyg.ipm.illinois.edu/article.php?id=379
IN THIS ISSUE:
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Based on degree day base 50 degrees F, we still about
three weeks ahead of schedule in southern Illinois, two to two and one-half
weeks ahead in central Illinois, and two weeks ahead in northern Illinois. As
described in earlier issues of this newsletter, most insect development
proceeds at temperatures above approximately 50 degrees F. Bagworms and jumping
oak galls are discussed.
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Japanese beetle adults have emerged in southern Illinois,
with reports of them being seen during the past week in Massac, Fayette,
Madison, Jackson, and Effingham Counties. Thanks to Ron Hines, Robert Bellm,
Steve Wunderle, and Kevin Black for their reports. They will probably emerge in
central Illinois by June 10.
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Various Rust fungi infect a wide range of plant hosts.
Hollyhock is commonly a host to the fungal rust Puccinia malvacearum. This rust pathogen is classified as an
autoecious fungi, meaning the spore stages require only one host. Puccinia malvacearum is known to also infect
several species of the mallow family (Malvaceae), which includes the common or
roundleaf mallow (Malva rotundifolia), a common weed. Common mallow can act as a temporary site for
the rust spore to reside before it infects hollyhock.
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Reversion is a term used to describe when a cultivar,
known for a particular leaf shape, color, or other characteristic, 'reverts'
back to a different form found in the plant's parentage. The term is often used
to describe a variegated shrub or tree that produces non-variegated shoots.
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The ditches and roadsides of Central Illinois are showy
right now with the white flowers of Poison hemlock (Conium maculatum). This plant is found statewide however in
dense stands, and has been in greater abundance in recent years earning a spot
on both a factsheet and a poster featuring exotic, invasive plants in Illinois
habitats. This biennial is native to Europe, Western Asia, and Northern Africa
and is commonly found in disturbed soils, pastures, meadows, roadsides, and
along pond edges. Poison hemlock tends to prefer moist soils but can tolerate
drier sites; it grows well in full sun or part shade.
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