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.

Avoid Alfalfa Winter Injury - Next Time

April 30, 2009

By Stephen Barnhart, Department of Agronomy

There have been reports of localized areas of winterkill and winter injury to forage and winter cereal grain crops this past winter in Iowa.  

The reports indicate damage on sites across the state, but the most extensive areas are in northeast Iowa.  There are reports of damage to alfalfa, orchardgrass, perennial ryegrass, winter wheat and winter triticale.

Soybean after Soybean

April 29, 2009

By Palle Pedersen, Department of Agronomy

A few people have called me this week regarding planting soybean after soybean. All cases were from southeast Iowa where many river bottoms were flooded for an extended period of time last year and growers were forced to plant soybean even though their plan was to plant corn. To get back into their field rotations this year soybean would need to be planted after soybean. Is that a problem?

April 27 Crop and Weather Report

April 29, 2009

By Doug Cooper, Extension Communications and External Relations

On April 27, Doug Cooper, Extension communications specialist, interviewed Iowa State University Extension climatologist Elwynn Taylor, integrated pest management specialist Rich Pope and corn agronomist Roger Elmore for the weekly crops and weather update.

Black Cutworm Treatment Options

April 28, 2009
Image of a black cutworm larvae on soil

By Jon Tollefson, Department of Entomology

As technology traits in corn seed increase seed prices and the price received per bushel increases, it is wise to consider black cutworm management in corn.  Many areas of Iowa were cool and wet last spring, 2008. That weather often delayed planting and created flooded areas that had to be replanted. These conditions may have caused black cutworms to be more common than usual.

When to Inoculate Soybean Seed in Iowa

April 28, 2009

by Palle Pedersen, Department of Agronomy

Soybean is a legume with a seed content of approximately 38 percent protein. Because of its seed protein concentration, soybean has a large nitrogen demand and continues to increase as yield increases. Total nitrogen accumulation for soybean is supplied by two sources: the nitrogen fixation and from the residual soil nitrogen pool.

Quick facts About Corn Nematodes

April 28, 2009
Table of nematode species and damage thresholds

Interest in corn nematodes is increasing with recent changes in corn production. Greg Tylka, extension plant pathologist, shares a few facts about the plant-parasitic nematodes.

Update on Corn Plant Populations and Seed Costs

April 24, 2009
Graph of corn grain yield as a percent of maximum yield at different plant populations at 32 sites in Iowa

By Roger Elmore and Lori Abendroth, Department of Agronomy

Plant populations continue to increase and, unfortunately, so do seed costs.  Certainly hybrids today withstand the stress of higher seeding rates better than ever before. In fact, higher seeding rates are one component that drove annual yield increases the last several decades.