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Issue No. 13/June 23, 2006

An Inventory of Field Crop Insect Issues in the Midwest
Synopses of June 20th reports from extension entomologists in Illinois, Iowa, Michigan, Nebraska, and Wisconsin are presented.

Western Corn Rootworm Adult Emergence Has Begun
Sightings have been made about 2-1/2 weeks ahead of schedule of adult western corn rootworms in Illinois. What factors in addition to temperature might explain the early emergence?

Get Ready for . . . Japanese Beetles
Enormous numbers of Japanese beetles have been caught in southern Illinois traps in the past week. Fight the urge to spray insecticides for control before pollination begins, unless defoliation is excessive.

Low Numbers of Soybean Aphids
Hot temperatures throughout most of the Midwest are probably suppressing soybean aphid development; numbers so far are low.

What We Can Learn from Plant Stands
Much of the future prospects for a crop can be approximated based on crop condition in mid- to late vegetative stages.

Regional Reports
Reports are provided this issue for northern, southern, and west-central Illinois.