New herbicide labels advice growers accomplish season-long edger control.
March 12, 2018 – Author: Bernard Zandstra, Michigan State University Extension, Department of Horticulture
Asparagus division is aing rapidly, and you should be authoritative analytical decisions about your edger ascendancy affairs for the year. Pigweed attrition to photosynthesis-inhibiting herbicides and ALS-inhibiting herbicides accept been accurate in several west Michigan asparagus fields, and you can be proactive in your edger ascendancy practices to aish these aggressive weeds and abstain development of added resistance. Fortunately, there are a cardinal of pre-emergence and post-emergence herbicides labeled for asparagus, and best edger problems are manageable.
The photosystem II inhibitor herbicides (Karmex, Lorox, Sinbar, Tricor) accept been acclimated broadly in asparagus assembly for over 50 years. This has led to attrition to this approach of activity in several pigweed species. These herbicides are able adjoin abounding added broadleaf and grass weeds, and should be allotment of an asparagus edger ascendancy administration plan. However, they should consistently be acclimated with addition balance herbicide with addition approach of action. Depending on the weeds present in a field, tank-mix ally ability accommodate Prowl H2O, Dual Magnum, Callisto, Spartan or Command.
An early-season balance herbicide appliance additionally should accommodate a edger surface-active herbicide, such as glyphosate (Roundup), paraquat (Gramoxone) or carfentrazone (Aim). This aggregate will annihilate emerged weeds and aish new formation of best anniversary weeds. Unfortunately, several abiding weeds will not be controlled able-bodied with these combinations, and will charge to be managed with post-emergence herbicides, either in the crop during autumn or afterwards autumn is complete for the year.
A new herbicide characterization for 2018 allows appliance Quinstar 4L (quinclorac) afterwards asparagus autumn is accomplished for the division for authoritative several assiduous weeds in asparagus fields. Quinstar controls acreage and barrier bindweed, and suppresses Canada thistle, abiding sowthistle, morningglory, accepted lambsquarters and Russian thistle. It additionally is alive adjoin ample crabgrass, barnyardgrass and foxtail.
Quinstar may be activated at 12 aqueous ounces per acre (0.375 pounds alive additive per acre) in one appliance per year. Crop oil apply (COC) or methylated berry oil (MSO) additional a nitrogen antecedent should be added to the aerosol mix to advance herbicide activity. This is a Supplemental characterization for Michigan. Copies of the characterization should be accessible from Michigan State University Addendum educators and pesticide dealers.
Command 3 ME was labeled for asparagus in 2017. It provides acceptable ascendancy of anniversary grasses, accepted lambsquarters, accepted groundsel, accepted ragweed and velvetleaf. Command has a approach of activity altered from all added asparagus herbicides, and its use will advice abstain attrition to added balance herbicides acclimated on asparagus. Command is a acceptable tank-mix accomplice with the PS II inhibitors, but does not ascendancy pigweeds.
The afterward herbicides accept approved capability on the listed weeds. The akin of ascendancy may be variable, but appliance the herbicides will about advance authoritative the weeds. Please agenda that some are pre-emergence herbicides and some are post-emergence herbicides. Also, bethink that herbicides accept an alive activity in the clay of about four to eight weeks, afterwards which they dissipate.
Note and almanac the attendance of edger breed in anniversary field, and mark abiding edger areas for analysis at the adapted time. Weed-free fields aftereffect in bigger autumn conditions, cleaner artefact and college yields.
Please see MSU Addendum account E0433, “Weed Ascendancy Guide for Vegetable Crops,” for accepted recommendations and a account of added weeds controlled by the herbicides.
Dr. Zandstra’s assignment is adjourned in allotment by MSU’s AgBioResearch.
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