May 26, 2010 – Author: Bernard Zandstra, Michigan State University Extension, Department of Horticulture
Editor’s note: This commodity is from the athenaeum of the MSU Crop Advisory Team Alerts. Analysis the characterization of any pesticide referenced to ensure your use is included.
Ladysthumb smartweed, marsh yellowcress and Virginia pepperweed are beginning in ample numbers in onion fields. We see these weeds every year, but they assume to be accomplishing awfully able-bodied this spring. Unfortunately, none of the preemergence herbicides registered for onions accord acceptable or bigger control. Onions that were buried aboriginal are in the 2 blade date (2 LS) or larger, and can be advised with postemergence herbicides. Late buried onions that are still in banderole or one blade stages present a greater problem.
In general, onions in the abounding 2 LS (i.e., the leaves are at atomic four inches tall), are absolutely advanced of oxyfluorfen (GoalTender) at ante including 4 fl oz/ acre (0.125 lb alive additive (ai). The contempo sunny, hot acclimate has apathetic the onion leaves so they can bear a aerial bulk of oxyflurofen. Growers should use GoalTender beneath accustomed altitude because of its bigger assurance on onion. However, the old conception (Goal 2 XL) is an EC formulation, and the carrier increases the action adjoin the weeds. Goal 2 XL gives hardly bigger annihilate of beyond and added advanced weeds, such as we currently are facing. Goal 2 XL additionally will account added crimper and agee of onion leaves. Onions will survive this injury, but may not survive the edger burden if the weeds are not controlled.
I usually do not acclaim use of Buctril in the aerosol mix at this stage, although it is labeled for use on onions with two to bristles leaves. I accept apparent too abundant onion abrasion and crop abridgement from use of Buctril. However, Buctril is added able adjoin these weeds than Goal, and if growers accept that they accept no added alternative, they should use it abandoned and in a minimum of 50 gallons of baptize per acre. The labeled bulk is 0.125-0.25 lb ai/acre (0.25-0.5 pt/acre of the 4EC formulation). Be abiding to analysis the formulation, because there are generics accessible with the old 2EC formulation. You will charge to bifold the bulk per acre with the 2EC formulation.
Chateau gives fair to acceptable preemergence and postemergence ascendancy of smartweeds and mustards. It is labeled for use on onions at the 3-6 LS. At 2 fl oz per acre (0.064 lb ai), it will annihilate best of these weeds up to two inches tall. When there is a huge bane as we accept this year, there will be some escapes. It ability crave duke weeding to aish any weeds that escape. Otherwise, they will abide to abound throughout the season.
If onions are not up to the 2 LS stage, be actual accurate with any herbicide applications to abstain angle accident and abiding crop reduction.
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