Determining methods to prevent seed rot in soybeans is Dr. Tom Allen, Assistant Extension and Research Professor at Mississippi State University. Photo by John LaRose, Jr.
the timed strobilurin (e.g. Headline or Quadris) fungicide application, is most beneficial in situations with continuous soybean on irrigated ground, or what is more regularly considered to be a ‘high- yielding’ situation. Not only does the R3/R4 growth stage application provide a minor yield enhancement, the application prevents some late-season diseases. But, with that said, the R3/R4 application does not provide season long protection from fungal diseases especially in the case of seed rotting organisms.” Prior to 2009, it was suggested that ap-
Curbing Seed Rot
Study Focuses On Causes Of Seed Rot In Soybeans
BETTY VALLE GEGG-NAEGER MidAmerica Farmer Grower
sion and research professor at Mississippi State University. “Here at Mississippi State Uni-
M
versity, several scientists are in- volved in a project to determine methods to prevent seed rot, specifically in maturity Group IV soybeans,” he said. “In 2008, some Mississippi soybean producers sustained seed damage from late- season rain, and in 2009 we im- plemented a seed quality project at three locations. Our goal was to determine whether or not existing management practices could be implemented to limit the seed rot that was occurring as a result of prolonged inclement environmen- tal conditions prior to physiologi- cal maturity.” In the past, stink bugs have been
associated with seed rot since they feed by piercing. Wounding of soy- bean pods by puncturing could po- tentially allow moisture into the pod and increase the risk of fungal infection resulting in a seed rot sit- uation. “Generally speaking, high tem-
peratures and a period of pod wet- ting and drying, typically occurring during periodical wet periods, can directly influence harvested seed quality,” Allen explained. “So to implement the project we consid- ered managing stink bugs with an insecticide and building off of the typical R3/R4 strobilurin fungicide application. We specifically con- sidered azoxystrobin and bifen- thrin alone and as a tank mix combination. Applications were made at several different timings, including the more typical R3/R4 growth stage timing. However, in the Mississippi production system
18• MidAmerica Farmer Grower / March 2, 2012 STONEVILLE, MISS.
anaging seed rot in soy- beans was discussed by Dr. Tom Allen, assistant exten-
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CONTINUED ON PAGE 29
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