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While the number of fields with resistance to Cry3Bb1 corn is small at this time in Iowa, it should be noted that similar damage has been reported in other states. Research highlights the importance of incorporating integrated pest management and insect resistance management into field crop production.
Increasing corn yield and harvest of cornstalks for feed, bedding or bioenergy production are generating numerous questions about phosphorus (P) and potassium (K) concentrations in cornstalks and removal.
The availability of new products to manage plant-parasitic nematodes that feed on corn has increased the interest in the occurrence of these pests in Iowa. The results of testing for nematodes that feed on corn in Iowa from 2000 through 2010 were recently summarized and the main findings are contained in this article.
By Laura Jess, Plant and Insect Diagnostic Clinic and Erin Hodgson, Department of Entomology
A new, pocket-sized identification card for stink bugs in the Midwest will make identification of these insects much handier. Iowa State University Extension has just released the new identification card from authors Laura Jesse, Erin Hodgson, Donald Lewis, Matt O’Neal and Adam Sisson. The card was made possible with funding from a 2011 North Central IPM Center mini-grant.
Plant-parasitic nematodes can reduce both corn and soybean yields in Iowa. Fall is an ideal time to sample fields for the soybean cyst nematode (SCN), but not for nematodes that feed on corn. Fall SCN sampling guidelines are discussed in this article.
Farmland in western Iowa and eastern Nebraska affected by flooding early this year and not planted to any crop has potential economic and soil environmental consequences if the soils are left unattended.
It is almost time that anhydrous ammonia (NH3) applications could begin, however, many soils in Iowa are quite dry this fall. So, can anhydrous ammonia be applied to dry soil? Will it be held in dry soil?
The Iowa State University Integrated Crop Management Conference will be held Nov. 30-Dec. 1 on the Iowa State campus.
Soybean cyst nematode (SCN) is effectively managed with resistant soybean varieties grown in rotation with corn, and Iowa growers have hundreds of SCN-resistant soybean varieties from which to pick. ISU Extension recently updated the list of SCN-resistant soybean varieties in late maturity group 0 and maturity groups 1, 2, and 3.
Daren Mueller, Department of Plant Pathology and Microbiology
During the 2011 season several foliar diseases were present in Iowa, including brown spot, Cercospora leaf blight and frogeye leaf spot. The disease that was noticeably higher in 2011 compared to previous years was frogeye leaf spot, at least in susceptible varieties. The pathogen that causes frogeye leaf spot, Cercospora sojina, has been in the news several times the past couple of years because of reports of resistance to strobilurin fungicides.
