Weed control in sweet corn: tolerance to HHPD herbicides; control of nutsedge; and flame weeding in high-residue systems (2011)

Report to the Oregon Processed Vegetable Commission

Ed Peachey
OSU Dept. of Horticulture

George Clough
OSU Hermiston Ag Exp Station


  1. Determine sweet corn tolerance to HPPD herbicides combined with chloroacetamide herbicides such as Dual Magnum.
  2. Determine the potential of controlling nutsedge in sweet corn with HPPD herbicides incombination with other products.
  3. Evaluate strategies to improve flame weeding efficacy in high-residue systems.

VegNet Regional Pest Monitoring Program


COOPERATORS: Manual Silveira and Jim Gill, NORPAC; Wayne Parker, Jason White, and Neil MacInnes, National Frozen; Jon Brown, Truitt Bros; Larry, Ron, and Molly Pearmine, Richard Haener, Mark, Mike, and Cory Dickman, Skip Gray, Oscar Lopez, Matt and Gary Cook, Karl, Nancy, and Kenny Hendricks, Tom and Sam Sweeney Farm. Technical support for this project was provided by Pami Opfer and Jose Hernandez.

Management of Fusarium diseases of sweet corn in the PNW: Seed microflora influence on disease and development of Fusarium-free seed

Objectives for 2011 and Accomplishments:

1. Examine the yield and disease levels of sweet corn plants grown from seeds treated with germicidal light.

2. Evaluate biological applications to sweet corn seed parents and subsequent Fusarium presence on silks and seed infection/contamination.


Root Rot of Sweet Corn in the Willamette Valley

Root rot of sweet corn is an important disease of sweet corn in the Willamette Valley of Oregon, first diagnosed in the 1990's.  Root rot is caused by a disease complex including Pythium arrhenomanes, Phoma terrestris, and Drechslera spp. Severe root rot was shown to reduce yield in Golden Jubilee by as much as 3 T/A and Super Sweet Jubilee by 1.5 T/A. Root rot also impacts crop quality by reducing ear fill and dimpling corn kernels.

Cultivar Evaluation for Control of Common Smut in Sweet Corn in the Columbia Basin (2010)

Twenty-two sweet corn cultivars were evaluated for resistance to natural infection by common smut. Four cultivars (Jubilee, Krispy King, Summer Sweet 610, and Supersweet Jubilee) have been included in all 12 years of these evaluations to gauge the relative severity of smut pressure over that time and in each trial season.