Integrated Crop Management News

Links to these articles are strongly encouraged. Articles may be republished without further permission if published as written and if credit is given to the author, Integrated Crop Management News, and Iowa State University Extension and Outreach. If articles are used in any other manner, permission from the author is required.

Crop Minutes: Goss's Wilt and Soybean Cyst Nematode Scouting

June 28, 2011

Alison Robertson, ISU Extension plant pathologist, found symptoms of Goss's wilt in a west central Iowa field, a field with a history of the disease. During the June 27, 2011 Crop Minute, she tells how to identify the disease and actions to take to management Goss's wilt. While there is no rescue treatment for the disease, she recommends steps to take to identify Goss's wilt and  management actions to consider.

Predicted Corn Rootworm Egg Hatch Approaching

June 23, 2011
Accumulated degree days Jan. 1-June 21

Corn rootworm egg hatch in Iowa can occur from late May to mid June depending on soil conditions, but the average hatching date is around June 6. See date predictions for 2011.

Flooding and Stored Grain

June 22, 2011

Iowa Secretary of Agriculture Bill Northey reminded farmers in a news release June 21 that grain impacted by flood waters is considered adulterated and cannot be used for feed or food. He references this article by Charlie Hurburgh and Dan Loy.

Yellow Leaves Emerge from Twisted Whorls - 2011

June 22, 2011
Yellow leaves resulting from twisted whorls associated with an application of a growth regulator herbicide

By Roger Elmore, Department of Agronomy

Yellow leaves wave above V5 to V8 corn canopies in northern and central Iowa this week.   These sun-starved leaves freshly emerged from twisted whorls will turn green soon after they begin intercepting sunlight.

Potential causes are numerous:  rapid growth coupled with a wide range of temperatures, hail, strong winds or an application of a herbicide, insecticide or fungicide, etc. 

SCN Females Now Apparent on Soybean Roots

June 21, 2011
White, adult SCN females on soybean roots

The soybean cyst nematode (SCN) is a serious yield-limiting pest in the Midwest, and adult SCN females can be seen with the unaided eye as small, white objects on soybean roots. Recently, adult SCN females were observed on soybeans that were planted in early to mid May in north central Iowa, indicating that fields can be checked now for the presence of SCN.

Oats for Forage

June 21, 2011
Three stages of oat development

By Steve Barnhart, Department of Agronomy

Oats have been an important crop in Iowa. In addition to being a favored spring-planted companion or cover crop for forage seedings, they have historically been harvested as a cash grain crop. In recent years, as market demands and cropping systems have changed, oats are more often being harvested as hay or silage for livestock.