USING SCN EGG COUNTS AND HG TYPE TESTING TO FINE-TUNE SOYBEAN VARIETY SELECTION
Extension Education
Pat Miller
Agronomy Specialist
University of Missouri Extension
Nevada
Abstract
\r\n Few producers take SCN egg counts. Even those with high counts seldom have an HG test done. Those that do have an HG test done often don’t realize that they can put in two of their own variety selections. This study started out with the purpose of showing producers how they can benefit from putting in two varieties they currently grow or are planning to grow. As best as I could determine, all the varieties that the producers included were SCN resistant, mostly with a PI88788 source. Over eighty percent of the time the producer-provided varieties produced more cysts than the parent source PI88788 and all had a female index or over 10%. Over half had a female index over 50%. Two had an index over 100%: 101 and 102%. An index of over 100 meant that there were more eggs on that variety than there were on the susceptible check. A quick look at the resistance charts in the back of the Soybean Missouri Crop Performance book shows the producer dilemma: over 99% of the varieties have PI88788 for their source of resistance. The few that use another source are not Roundup Ready and have a maturity date that pushes the limits for our area. But with extremely high SCN egg numbers and limited rotation choices, producers may need to look at these varieties with other sources of resistance.
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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: P.D. Miller
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Miller, P. Agronomy Specialist, University of Missouri Extension, Missouri, 64772