Integrated Crop Management News

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Corn Emergence in 2009

May 6, 2009
Image of a corn plant emerging

By Roger Elmore, Department of Agronomy

Corn spikes through fertile soil of early-planted fields in most parts of Iowa as I write.  According to the May 4, 2009 USDA-NASS estimates, 2 percent of Iowa's corn is emerged compared to none last year and the five year average of 7 percent. 

A Harsh Winter for Bean Leaf Beetles

May 6, 2009
Image of predicted bean leaf beetle winter mortality and accumulated subfreezing degrees in Iowa

The 2008-2009 Iowa winter was unusually cold, and overwintering bean leaf beetle populations may be considerably lower than in previous years.

Degree Days - Off on a Muddy Track

May 6, 2009
Image of base 50 degree F degree days in regions of Iowa from May 1 to May 4, 2009

By Rich Pope, Corn and Soybean Initiative

Today's article is the first weekly post that monitors accumulation of degree days through the 2009 growing season. The map below shows the base 50 degree F days that have accumulated in each of Iowa's nine crop reporting districts, and the departure in accumulations from long-term averages.

Accumulated degree days May1 through May 4, 2009

May 4 Iowa Crop and Weather Report

May 5, 2009

This week's crop and weather report includes interviews with Elwynn Taylor, Iowa State University Extension climatologist; integrated pest management specialist Rich Pope; soybean agronomist Palle Pedersen; and soybean entomologist Erin Hodgson.

It appears that La Niña is dead—effective Monday, May 4, 2009, according to Taylor. He doesn't guarantee ideal growing season weather, but says it should eliminate extremes in temperature and precipitation.