Integrated Crop Management News

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Degree Days - More Heat and Humidity with Bigger Weeds

June 30, 2009
Image of base 50 degree F degree days in regions of Iowa from May 1 to June 28, 2009

By Rich Pope, Department of Plant Pathology

Summer burst through the doors with a blast of heat and humidity. Although oppressive to people, it allowed for rapid growth of both crops and weeds.  Weeds are a considerable concern in most areas, most notably where pre-plant burn downs were skipped, and where spraying has been prevented by wet fields. Most areas of Iowa gained 20 to 25 degree days more than the average mid-June week.   Read more about Degree Days - More Heat and Humidity with Bigger Weeds

June 29 Iowa Crop & Weather Report

June 30, 2009

By Doug Cooper, Extension Communications

Listen to Doug Cooper, Extension communications specialist, as he interviews Iowa State University Extension climatologist Elwynn Taylor, integrated pest management specialist Rich Pope, and sybean agronomist Palle Pedersen.

During the weekly interview, Taylor says hot humid temperatures should be behind us for a few weeks with a return to cooler and drier weather. Read more about June 29 Iowa Crop & Weather Report

Hail Injury on Corn

June 19, 2009
Image of a hail damaged corn field

By Roger W. Elmore and Lori Abendroth, Department of Agronomy

Hail pounded various parts of Iowa over the last two weeks. Storm systems continue to march aggressively across the state. Shredded, twisted corn lies in their paths (Figure 1). Corn across the state ranges from 6th to perhaps the 10th leaf stage. That means that corn growing points extend above the ground. Damage to the growing point compromises recovery and yield.

Cornfield Read more about Hail Injury on Corn