New vegetable weed control labels for 2010

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.

Several new and revised herbicide labels for vegetable crops have been received during the past year. Most of these labels are included in the 2010 edition of Extension Bulletin E-433, Weed Control Guide for Vegetable Crops. A few have been issued since the bulletin was published in December 2009. For more information on these and any pesticide labels, please check the web at www.cdms.net. You will need to know the company that manufactures a chemical to find the label. E-433 contains that information, and printed copies can be obtained from the MSU Bulletin office, or from county MSU Extension offices. The weed control bulletin and other vegetable information also can be accessed on the web at www.veginfo.msu.edu.

GoalTender 4 SC(oxyfluorfen) is now labeled for postemergence broadleaf control in broccoli, cabbage and cauliflower. It may be applied at 4-8 fl oz (0.125-0.25 lb ai) per acre after transplants are well-established. GoalTender will kill many small broadleaves, but it is weak on mustards, common chickweed, common lambsquarters and smartweeds. Do not add a surfactant to the mix. Do not use Goal 2XL for this use.

Caparol 4 L(prometryn) may now be applied to celery in two applications of one (1) quart (1 lb ai) per acre each. In the past, we were limited to one application of 2 qt. The change will allow growers to split the application (same total amount of product per year) to extend weed control options.

Chateau 51 WG (flumioxazin) and Prowl H20 3.8 CS (pendimethalin) may be tank mixed for application to onions at the 3-leaf stage or later. Both chemicals provide good preemergence control of several annual grasses and broadleaves. Do not mix Chateau with any other chemicals or formulations, since the petroleum solvent carriers of most herbicides exacerbate the activity of Chateau, and can cause serious crop injury. The combination of Chateau and Prowl H2O will control difficult annual broadleaves, such as marsh yellowcress, Virginia pepperweed, and ladysthumb smartweed. Chateau also will improve control of common lambsquarters and redroot pigweed.

Prowl H2O (pendimethalin) is now labeled for preemergence application to dormant asparagus. It should be applied in the early spring before asparagus emerges. Use up to 8.2 pt (3.9 lb ai) per acre. There is a 14-day preharvest interval (PHI). Prowl H2O applied in a tank mix with Karmex, Sinbar, Sandea, or Callisto will provide good harvest season-long control of most annual weeds. These combinations will not control perennial broadleaves, quackgrass, or yellow nutsedge.

Prowl H2O is labeled for use in newly transplanted or subsequent year perennial strawberries, as well as for newly transplanted day neutral and annual strawberries. Apply 1.5 - 3.0 pt (0.71-1.4 lb ai) per acre in one or two applications. It also may be applied at renovation. There is a 6 pt per acre maximum amount per year, and a 35-day PHI.

Spartan 4 F (sulfentrazone) has received a Section 18 emergency label for use at renovation on perennial strawberries in Michigan for 2010. This is about the eighth year of this Section 18 label. Spartan may be applied at renovation at 4 - 8 fl oz (0.125-0.25 lb ai) per acre and again at fall dormancy. A total of 12 fl oz may be applied to a crop in any year. Spartan controls many broadleaves and some annual grasses. It is a very active pigweed material. It also gives good control of common groundsel, field pansy, mayweed, white campion (white cockle), and yellow woodsorrel. We anticipate that the Section 3 (federal) label for Spartan on strawberries should be issued during 2010, which will end our need for an emergency label in subsequent years.

As other new herbicide labels are issued for vegetable crops, we will publish the information in the Vegetable CAT Alert as well as post the label at www.veginfo.msu.edu.

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