Weed control update for 2010

A number of new herbicides and herbicide combinations have become available recently. Here’s a summary of some of the new ones, as well as a few introduced last year. Iowa State University Extension weed scientist Mike Owen provides this update.

The list doesn’t include all of the available products, particularly given that so many generic products are now available. Including a product on this list doesn’t mean that it is recommended over another product, he notes, and exclusion of a product doesn’t mean the product should not be considered.

Key Points

• Various new herbicides and combinations have come on the market recently.

• Not all the new products are on this list; there are a number of new generics.

• Just because a product isn’t described here doesn’t mean it shouldn’t be used.

New on the scene

The following list includes some of the new herbicide products on the market:

Accent Q is a prepackage herbicide mixture from DuPont containing nicosulfuron and isoxadifen (safener). It can be applied postemergence to corn for control of emerged grass weeds and some broadleaf weeds.

Only 0.9 ounces of product is applied per acre to small grasses. Accent Q can be applied to corn up to 20 inches tall, or V6 growth stage, whichever is more restrictive. ALS-resistant weeds will not be controlled.

Callisto Xtra is a prepackage herbicide mixture from Syngenta. It contains mesotrione and atrazine and will be positioned for glyphosate-tolerant corn as an additive to glyphosate. Callisto Xtra provides postemergence control of some annual grasses and broadleaf weeds, as well as some residual control of various broadleaf weeds. Apply 20 to 24 ounces of product per acre postemergence to corn and small weeds. Don’t apply it to corn taller than 12 inches.

Integrity is a prepackage herbicide mixture from BASF that includes Kixor (saflufenacil 6.24%) and dimethenamid-P (55.04%) for early preplant, preplant incorporated and preemergence applications in corn.

Integrity contains a PPO inhibitor herbicide (saflufenacil) and a choracetamide (dimethenamid-PO) that inhibits weed root and shoot development. Integrity provides burndown control of annual broadleaf weeds and residual control of some broadleaf and annual grass weeds, as well as contact activity on emerged weeds.

The best geographic fit is typically south of Interstate 80 due to recropping considerations and soil pH issues.

Kixor (saflufenacil) is marketed by BASF as a component of other products such as Sharpen, Integrity and Optill. Kixor is a PPO inhibitor herbicide in a new class called pyrimidinedione herbicides. Kixor provides contact activity as well as residual control of some broadleaf weeds.

Optill is a prepackage mix from BASF that includes Kixor (17.8%) and imazethapyr (50.2%) for burndown, and preplant incorporated or preemergence application in Clearfield corn hybrids and soybeans for control of annual grass and broadleaf weeds.

Optill contains a PPO inhibitor herbicide (saflufenacil) and an ALS inhibitor (imazethapyr). Apply 2 ounces of product per acre. Refer to label for details on application procedure and restrictions.

Prequel is a prepackage mixture from DuPont for burndown weed control that also provides residual control of winter annuals, grass and broadleaf weeds. Prequel contains an HPPD inhibitor herbicide (isoxaflutole 30%) and ALS inhibitor herbicide (rimsulfuron 15%). Prequel can be used in both GM corn and conventional hybrids and can be applied prior to planting or preemergence. Apply prior to crop emergence as injury to emerged corn is likely.

Sharpen is Kixor (saflufenacil 29.74%) for burndown and residual broadleaf weed control in corn, soybean and other crops. Applications may be made early preplant surface applied or incorporated (up to 14 days prior to planting), or it can be applied preemergence. Don’t apply after crop emerges, as severe injury will occur. Refer to label to determine appropriate rate of application.

Steadfast Q is a prepackage herbicide mixture from DuPont containing nicosulfuron and rimsulfuron (ALS-inhibitor herbicides) and isoxadifen (safener). Steadfast can be applied postemergence to corn for control of emerged grass weeds and some broadleaf weeds. Rimsulfuron in this product provides some residual weed control.

Apply 1 to 5 ounces of product per acre to small grasses. Steadfast Q can be applied to corn up to 20 inches tall or V6, whichever is more restrictive. ALS-resistant weeds won’t be controlled.

Vida herbicide is marketed by Gowan and is positioned as a tankmix companion for glyphosate for preemergence burndown applications for broadleaf weed control in corn and soybeans.

Vida is pyraflufen ethyl (2.5%) and formerly was marketed as ET herbicide. While Vida does have an early postemergence label, crop injury can be severe if applied early-post. Vida is a PPO inhibitor herbicide.

Source: ISU Extension

This article published in the April, 2010 edition of WALLACES FARMER.

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