Issue No. 13, Article 6/June 23, 2006
Extension center educators, unit educators, and unit assistants in northern, west-central, east-central, and southern Illinois prepare regional reports to provide more localized insight into pest situations and crop conditions in Illinois. The reports will keep you up to date on situations in field and forage crops as they develop throughout the season. The regions have been defined broadly to include the agricultural statistics districts as designated by the Illinois Agricultural Statistics Service, with slight modifications:
- North (Northwest and Northeast districts, plus Stark and Marshall counties)
- West-central (West and West Southwest districts, and Peoria, Woodford, Tazewell, Mason, Menard, and Logan counties from the Central district)
- East-central (East and East Southeast districts [except Marion, Clay, Richland, and Lawrence counties], McLean, DeWitt, and Macon counties from the Central district)
- South (Southwest and Southeast districts, and Marion, Clay, Richland, and Lawrence counties from the East Southeast district)
We hope these reports will provide additional benefits for staying current as the season progresses.
Corn throughout northern Illinois has benefited from warm daytime temperatures coupled with cool nighttime ones. Reports have been received from many areas throughout the region regarding poor growth or uneven growth in the same field. Some of the causes have been identified as early-season cold injury, herbicide injury, and corn rootworm larvae feeding on plant roots.
Activities the past week have focused on finishing up postemergence herbicide applications on corn and applying postemergence applications to soybeans.
Just a reminder: the annual Weed Control Twilight Tour at the University of Illinois Northern Illinois Agronomy Research Center, Shabbona, will be held Thursday, July 6, beginning at 5:00 p.m. U of I weed scientists and graduate students will discuss some of more than 20 weed control research studies being conducted at the center. At the conclusion of the 90-minute tour, a meal will be available on site.
Hot, dry weather has facilitated wheat harvest but at the same time stressed later-planted corn. Wheat harvest is more than 80% complete in most areas, with reported yields ranging from 55 to more than 100 bushels per acre. The bulk of the wheat will probably be in the 65- to 85-bushel range. Test weights are below last year and are running from 57 to 59 pounds.
The earliest-planted corn should begin tasseling in the upcoming week. Late-planted corn with smaller root systems is showing the effects of hot weather by beginning to roll up in the early afternoon heat.
Soybean fields show considerable variability in both stand density and growth rate. A high percentage have not yet had postemergence herbicide applications, and volunteer corn, waterhemp, cocklebur, and other weeds are becoming obvious.
Japanese beetle emergence is in full swing throughout the region, and cornfields will need to be monitored as pollination time approaches. Driving through a swarm of these beetles at 60 miles an hour simultes a hailstorm on the windshield.
Corn has grown rapidly over the past few weeks. Early-planted corn is very close to tassel emergence. Some of the drier areas are reporting leaf roll during the heat of the afternoon on end rows or lower-organic-matter areas of fields. European corn borer infestations are evident in some fields, and moths are still active.
Soybean growth, where moisture isn't limiting, is also rapid. Early-planted soybeans are at the V6 stage. Some of the drier areas are reporting leaf rolling during the heat of the day.
Wheat harvest has started in the southern areas of the region. No reports yet on yield or test weight.
Second harvest of alfalfa has been taken on some fields. Yields vary according to rainfall since first harvest. Potato leafhopper numbers are impressive in some fields.
Emergence of Japanese beetle has been noted.