Spring weather has given winter annual weeds a great start. Now is the time to take action against them and protect crop yields.
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.
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.
The 2008-2009 Iowa winter was unusually cold, and overwintering bean leaf beetle populations may be considerably lower than in previous years.
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.
By Sorrel Brown, Ag and Natural Resources Extension
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.