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Fomesafen Carryover: Fomesafen is the active ingredient in Flexstar, Reflex (and one of the ingredients in Prefix). There is a 10 month crop rotation restriction to corn with fomesafen. The 10 month rotation of fomesafen can be termed an agronomic restriction, because Fomesafen can carryover and injure corn. More information is available from this article by Bob Hartzler.
Dry soil conditions in last season may have delayed the breakdown of fomesafen. Fomesafen degrades better with moist soil conditions after application.
Product rate/acre lb of fomesafen active ing./acre
Flexstar 16 fl oz 0.235
Reflex 16 fl oz 0.25
Flexstar GT 3.5 3.0 pt 0.21
Marvel 7.3 fl oz 0.16
Prefix 2.0 pt 0.25
Nitrogen Tests: The late spring nitrogen test (LSNT) can be useful to confirm nitrogen (N) levels or nitrogen needs. Fields that have had manure with questionable N content, or fields where N rates were less than planned may be good candidates for the LSNT.
Weed Control in Larger Corn: The following is some selected information for weed control in larger sized corn.
Product Corn Size/Stage Notes on Weed Control
Atrazine up to 12 inch
Callisto V8, or 30 inch up to 10-inch
lambsquarter, waterhemp
Capreno 6 up to 6 inch
lambsquarter, waterhemp
Glyphosate V8 or 30 inch ht rates are weed size
dependent
Halex GT V8
Impact/Armezon V8 6 inch lambsquarter,
waterhemp
Laudis up to V9 6 inch lambsquarter,
waterhemp, velvetleaf
Liberty up to V7 4-6 inch weeds
Realm Q V6 or 20 inch 1-2 inch grass, 5 inch
broadleaves
Status V10, or 36 inch 3-4 inch weeds
Surestart 11 inch corn
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