Starane Ultra labeled for onions in Michigan

Editor’s note: This article is from the archives of the MSU Crop Advisory Team Alerts. Check the label of any pesticide referenced to ensure your use is included.

The Michigan Department of Agriculture has approved an SLN (Section 24c) label for use of Starane Ultra (fluroxypyr) on dry bulb onions in Michigan. Starane Ultra is a hormone-type herbicide that is taken up by the leaves of a plant and disrupts the normal plant growth system. Starane Ultra gives good control of several broadleaf weeds, including common chickweed, common ragweed, eastern black and hairy nightshades, horseweed, mustards, and volunteer potato.

To control broadleaves, apply 0.35 pt of Starane Ultra to weeds less than four inches tall. Please note that only the new formulation of Starane Ultra, which is a 2.8 lb ae/gal formulation, is labeled for onions. The original formulation, Starane 1.5 lb ae/gal, is not labeled for onion. Volunteer potatoes should be four to eight inches tall for optimum control.

Application to onions may be made as a broadcast over the top spray from the 2- to 6- leaf stage. After the 6-leaf stage, Starane Ultra should be applied with drop nozzles as a directed spray. Do not use an adjuvant with Starane Ultra on onions.

For heavy weed infestations, make two applications 10 to 14 days apart. Do not exceed two applications per year. Do not apply within 42 days of onion harvest.

Applicators must have a copy of the label when making applications. The label can be printed from the MSU vegetable website:

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