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
Callisto + Atrazine V8, or 30 inch up to 10-inch lambsquarter or waterhemp
Capreno V5 up to 6 inch lambsquarter
Glyphosate V8, up to 30 inch rates are weed size
Halex GT V8
Impact drops if needed 6 inch lambsquarter,
Laudis up to V8 6 inch lambsquarter,
Liberty up to V7 4-6 inch weeds
Status V10, or 36 inch 3-4 inch weeds
Surestart 11 inch corn
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.
Corn Rootworm hatch. Warm early season soil temps raised questions on the date of corn rootworm hatch. However, since soil temps in April and May were more normal, rootworm hatch will be about normal - or about June 6. Therefore corn rootworm damage is not expected to be any less or more than previous years.
ISU Research Farm Field days.
- June 26, Northern Iowa, Kanawha, 9:00 to 1:00.
- June 27, Northwest Iowa, Sutherland, 9:00 to 1:00.