August 12, 2005
Two Spotted Spidermites
The rains and humid conditions, as well as break in the heat should help to reduce problems with this pest. For more information see the July 22, 2002 ICM Newsletter at http://www.ipm.iastate.edu/ipm/icm/2002/7-22-2002/spidermites.html and the July 18, 2005 article at http://www.ipm.iastate.edu/ipm/icm/2005/7-18/spidermite.html.
Many fields have been sprayed
for soybean aphids in the northern part of the area, although aphid populations
have been considerably lower than what we saw in 2003. The rains should also
help to reduce aphid numbers, and the aphid population should start to
naturally decline in about a week. In many fields most of the aphids found
recently have been the small off-white aphids, rather than the larger
yellow-green aphids. It is the larger aphids that are the biggest threat to
rapid reproduction resulting in soybean yield losses, although we should not
ignore the small aphids in making treatment decisions. Hopefully spraying for
soybean aphids is nearing an end for the season, but fields should continue to
be scouted for another week or two for aphids. Treatment is recommended if
aphid numbers are increasing and surpass 250 aphids/plant.
For more information on soybean aphids see < http://www.ent.iastate.edu/soybeanaphid/>
and the July 11, 2005 ICM Newsletter at http://www.ipm.iastate.edu/ipm/icm/2005/7-11/aphids.html.
Asian Soybean Rust
Watch for Corn Ear Rots This Fall
Late Summer Seeding of Forages
FOR YOUR CALENDAR
Crawfordsville Fall Field Day - September 14 1:30 p.m.
If you have any questions, please feel free to contact the Iowa State University Extension Office.
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