Eyespot and Gray Leaf Spot Occurring in Corn
Diseases currently showing up in Iowa corn - eyespot and gray leaf spot - can result in yield loss and may increase the severity of stalk rot.
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.
July 13 Crop and Weather Report
By Doug Cooper, Extension Communications
The July 13 weekly crop and weather report includes interviews with Iowa State University Extension climatologist Elwynn Taylor, integrated pest management specialist Rich Pope, and soybean agronomist Palle Pedersen.
Taylor says El Niño may be about to return, but for it to have significant impact on Iowa agriculture the southern oscillation index will have to be at least minus 0.8, right now it is minus 0.1. He says El Niño is generally positive to Iowa crop production.
Degree Days - A Bit Wet and a Bit Wild
By Rich Pope, Department of Plant Pathology
Iowa weather continued to track cool and wet as degree days fell just a bit further behind long-term averages. With the cooler weather and precipitation since June 1 registering 168 percent of normal, many fields have remained damp.
Should Hail Damaged Crops be Sprayed With a Fungicide?
There are a limited number of studies conducted in Iowa on hail-damaged crops, but no significant yield responses have been seen from fungicides.
Don't Let Potato Leafhoppers Burn Hay
By Erin Hodgson, Department of Entomology
There have been recent reports of potato leafhopper in Iowa alfalfa, and it's time to think about sampling again. Potato leafhoppers do not overwinter in Iowa, but adults migrate here every spring.
July Workshops Offer Comprehensive Corn Nematode and SCN Training
Learn about biology,scouting and management of corn nematodes and soybean cyst nematodes, and earn certified crop advisor CEUs in two-all day workshops.
It is Time to Sample for Corn Nematodes
Many believe that changes in corn production practices may lead to increased damage from nematodes. Mid-season sampling is required to accurately diagnose nematode problems on corn.
Considerations for Soybean Insecticides and Fungicides
NOTE: the following correction was made July 13, 'Punch will not be available for use on soybean in 2010 so check with local agriculture dealers if product is still remaining at the end of the season.' The original statement said Punch would not be available in 2009, which is incorrect.
Scouting Foliar Diseases in a Cool Summer
by XB Yang, Department of Plant Pathology
Corn: Uneven Early-Season Growth Can Mean Uneven Tasseling
Regardless of reason for uneven corn growth, uneven tasseling across the field can be expected.