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EVALUATION OF SEED TREATMENTS FOR SWEET CORN IN THE COLUMBIA BASIN OF WASHINGTON

Applied Research

Carrie Wohleb
Regional Extension Specialist
Washington State University Extension
Moses Lake

Abstract

\r\n    The International Sweet Corn Development Association (ISCDA) selects treatments for a multi-location seed treatment trial every year. Researchers from across the country evaluate the selected treatments for their effectiveness against seed-borne and soil-borne diseases that affect sweet corn stand and vigor. WSU Extension and the sweet corn industry in the Columbia Basin of Washington have participated in the trial for many years. The 2010 ISCDA Columbia Basin Seed Treatment Trial was established in a sweet corn field near Mattawa, WA to evaluate 27 seed treatments, including conventional and organic products, on sweet corn (var. SS Jubilee). Experimental design was a randomized complete block with four replications. Seeds were planted on 5 April, 2010. Stand counts and vigor ratings were recorded on 19 May, 2010. Data were subjected to ANOVA and means were separated using the Student-Newman-Keuls Test. Cool weather conditions at planting delayed germination and contributed to reduced stands and poor seedling vigor in the trial. The average stand count was only 24%, but mean stands for the treatments ranged from 1% to 72%. Ten of the 27 treatments had significantly higher stand counts compared to the untreated check (UTC). Seed treatments with the active ingredients captan, thiram, or carboxin consistently resulted in higher stands compared to the UTC. The seed treatments containing the organic fungicide, Agricoat Organic, did not perform any better than the UTC. This trial provides unbiased information about seed treatment products and helps identify the best performing seed treatments for sweet corn in the Columbia Basin.

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Poster has NOT been presented at any previous NACAA AM/PIC

This poster is being submitted for judging. It will be displayed at the AM/PIC if not selected as a State winner. The abstract will be published in the proceedings.

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Authors: C.H. Wohleb
  1. Wohleb, C. Extension Educator, Washington State University Extension, Grant-Adams County, Washington, 98823