June 24, 2010 – Author: Wesley Everman, Michigan Accompaniment University Extension, Department of Crop and Soil Sciences
Editor’s note: This commodity is from the athenaeum of the MSU Crop Advisory Team Alerts. Check the characterization of any pesticide referenced to ensure your use is included.
Many areas of the accompaniment accept been hit with wet acclimate this bounce that has kept them out of the fields during ideal postemergence herbicide appliance windows. As I accept apprenticed about the state, decidedly in the southern tiers of counties, I accept apparent abounding fields breadth weeds accept taken ascendancy and are as alpine as the blah or taller. The catechism again becomes “How backward can I aerosol my corn?” or “How alpine can my blah be back I spray?” These are important questions to be considered, and the acknowledgment is not consistently accessible back delayed postemergence applications in blah accept abundantly become a affair of the past.
The majority of herbicides activated postemergence to blah can be begin in Table 1J in 2010 Edger Ascendancy Guide for Acreage Crops Extension Bulletin E-434, which gives the acme restrictions for abounding accepted postemergence herbicides. An abbreviated table is listed beneath (Table 1).
It is acutely important to agenda that atrazine and atrazine-containing articles can abandoned be activated on blah up to 12 inches in height. Most of the blah in the accompaniment is now accomplished this stage, so added herbicide options will accept to be utilized. It is additionally important to bethink that glyphosate (Roundup Ready corn) can abandoned be activated to blah up to 30 inches or 8 collars and Ignite (Liberty Link corn) can abandoned be activated to blah up to 24 inches or 7 collars, so plan your herbicide applications accordingly. There are several articles that can be acclimated abandoned or in aggregate with these non-selective herbicides including the HPPD inhibiting herbicides Callisto (30 inches or 8 collars), Impact (up to 45 canicule above-mentioned to harvest), and Laudis (8 collars) or ALS absolute articles such as Hornet WDG (20 inches or 6 collars) and Resolve Q (20 inches or 7 collars) to accommodate both added postemergence and balance ascendancy of weeds. Postemergence applications of Accent Q or Steadfast Q can be fabricated to blah up to 20 inches or assuming 6 collars for grass and baby seeded broadleaf control. Several articles can be activated up to awning closure, including Permit and Resource for ascendancy of assertive broadleaf edger species. In attenuate cases breadth applications charge to be fabricated after still, Buctril can be activated until aigrette actualization or Impact can be activated up to 45 canicule afore harvest, abrogation a advanced window of application.
For all delayed postemergence applications, it is acutely important to accede circling crops for the 2011 season. The after an appliance is fabricated in the season, the greater the adventitious for abrasion to action the afterward division in acute crops. Argue Table 12 in the 2010 Edger Ascendancy Guide for Acreage Crops Extension Bulletin E-434.
If balance ascendancy of grass weeds is needed, articles absolute metolachlor (Dual II Magnum, Cinch, Stalwart C, Parallel) can be activated up to 40-inch blah and Prowl H20 can be activated up to 30-inch corn. As always, condensate is bare for activation of preemergence herbicides. For added information, see 2010 Edger Ascendancy Guide for Acreage Crops Extension Bulletin E-434 or argue herbicide labels.
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