Issue no. 10 of the University of Illinois Home, Yard & Garden Newsletter
IN THIS ISSUE:
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Last Weekly Issue
This is the last weekly issue of the Home, Yard, and
Garden Pest Newsletter for this year. During the summer, there are fewer pests
and management timing is less critical than in the spring. Issues will be
published every other week during July, August, and September. We will publish
a final issue in mid-October that will include an index to articles published
during the year.
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Leafminers
We have had several reports of columbine and other
leafminers around the state. They appear to be more numerous this year,
probably due to the heavy and frequent rains this spring. Most full grown
leafminer larvae burrow out of the leaf and drop to the soil to pupate.
Dropping onto moist soil increases their survival, resulting in the next
generation being more numerous. I don’t remember seeing entire leaves covered
with columbine leafminer mines previously, as in the accompanying photo.
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Japanese Beetle
Thanks to a variety of readers that responded to the
article last week on Japanese beetle. I can now report that they have been
present in southern and central Illinois since the third week of June and were
seen in LaSalle and Will Counties on June 24. With the warm temperatures of the
past week, they should have emerged in the rest of northern Illinois by now.
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Bagworm
Bagworms have hatched throughout the state and appear to
be a little early than normal. Treatment is recommended in southern and central
Illinois at this time as they have completed their ballooning and are settling
down to feed in earnest. They will still be ballooning in northern Illinois, so
treatment should be effective after the fourth of July.
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What Does Plant Disease Sanitation Really Mean?
A plant pathologist’s goal is to properly identify and
manage plant disease to reduce the economic and aesthetic damage to
plants. Unfortunately, many still think
that our goal is to control plant disease by spraying fungicides. We focus on
an integrated disease management approach, which includes exclusion,
eradication, protection, and resistance.
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Recommendations for sending suspected oak wilt samples to
the U of I Plant Clinic
Summer has arrived. Along with the new season, comes days
with extreme temperatures. High
temperatures have the potential to kill plant pathogens and thwart diagnostic
efforts before the samples arrive at the Plant Clinic. The pathogen responsible
for oak wilt is a good example. This fungal pathogen is intolerant of
temperatures above 90°F. It is also thought to be sensitive to drying and other
competing fungi. Exposure to these conditions during shipping may result in
inconclusive text results. Properly
packaging and shipping samples will greatly help reduce the potential for an
inconclusive diagnosis.
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Asiatic Dayflower – The Little Beauty that Caused So Much
Confliction
The jury is out on Asiatic dayflower. Half of them are out enjoying how their
gardens have been graced with this plant’s pretty blue flowers. The other half is and likely has been for
quite some time waging war on this invasive weed. How can we be so divided when it comes to
this plant?
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Modified Growing Degree Days (Base 50° F, March 1 through June 27)
Insect development is temperature dependent. We can use
degree days to help predict insect emergence and activity. Home, Yard, and Garden readers can use the
links below with the degree day accumulations above to determine what insect
pests could be active in their area.
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