Issue No. 13/June 17, 2005
ALERT:Add Japanese Beetles to the List of Concerns
A new report of Japanese beetle captures means we will be watching for them to threaten corn production (silk clipping during pollination) and soybean production (defoliation in excess of 30%). Keep scouting.
Soybean Scouting School
A free soybean scouting school will be held near St. Joseph on June 24. Lunch is included; please preregister.
Weed Science Field Day
The Weed Science Field Day will be held on June 22; the cost is $15, including lunch. Preregistration is encouraged.
First Reports of Significant Rootworm Larval Feeding This Year
Significant rootworm larval feeding injury to corn has been observed in a number of Illinois locations, including in fields where soil insecticides were applied at planting time in April.
Keeping Eyes on Soybean Aphids Throughout the Midwest
Recent reports point to the development of colonies of soybean aphids in soybean fields. Midwest entomologists generally agree that application of insecticides to control soybean aphids on young soybean plants will not pay for itself.
Twospotted Spider Mites: Quick Update
Though recent rainfall and projected cooler temperatures reduce concerns about the threat of twospotted spider mites, a return to dryer, hotter conditions will demand attention.
Caterpillars in Soybeans
Details are provided on the thistle caterpillar (the larval stage of the painted lady butterfly) and yellowstriped armyworms, both of which may be found feeding on soybeans.
Insect Trapping Results from Ron Hines
An update is given on captures of insect pests in various southern Illinois traps.
Heading into the Main Event
How corn plants develop yields is reviewed. Soybean plants have benefited from any recent rainfall. Wheat development has been greatly speeded up by warm temperatures; the dry weather since heading should mean relatively few diseases.
A report is provided this issue for southern Illinois.