Growing CLEARFIELD Wheat This Year?
Pacific Northwest wheat growers have a new tool for weed control in the form of CLEARFIELD wheat varieties that are resistant to the herbicide Beyond (active ingredient imazamox). When used in combination, the CLEARFIELD production system will control several weeds that have been difficult to manage in wheat. However, producers must remember the following key points:
Beyond does not control all major weeds.
Beyond is effective on jointed goatgrass and provides control of many other grasses and some broadleaf weeds. However, many situations will require an additional herbicide to achieve satisfactory weed control.
Use Beyond only on CLEARFIELD wheat varieties.
Non-CLEARFIELD wheat varieties will be severely injured or killed. Avoid drift, as even small amounts of herbicide can cause injury to non-resistant varieties.
CLEARFIELD wheat varieties are resistant to Beyond, not immune.
Apply Beyond only to a healthy, actively growing wheat crop. While CLEARFIELD varieties carry the herbicide resistance gene, crop injury can occur if the crop is stressed or unable to actively metabolize the herbicide due to cold, cloudy conditions. Minimize spray overlaps.
Use the recommended rate of Beyond.
Application of herbicide at rates higher than recommended can severely injure CLEARFIELD wheat varieties. Herbicide rates or water carrier rates lower than those recommended can result in poor weed control and select for herbicide resistant weeds.
Do not use the CLEARFIELD system more frequently than two out of every four wheat crops.
A more cautious approach of use once every third wheat crop may further contribute to the goal of preventing or delaying the development of herbicide resistant weeds. Use of herbicides with different modes of action over crops and years is a critical part of an effective resistance management strategy.
Be aware of cropping restrictions after use of Beyond.
Some rotational crops, including barley and oats, are very sensitive to Beyond or imidazolinone herbicide residues.
Read and understand the BASF Grower Stewardship Agreement.
You must read and sign the Stewardship Agreement prior to purchase or planting of any CLEARFIELD wheat variety.
It is illegal to save your own seed of any CLEARFIELD varieties being grown for seed.
You must purchase certified seed stocks each year to use the CLEARFIELD technology or purchase Beyond herbicide.
Beyond must be applied to CLEARFIELD varieties being grown for seed.
The Beyond application will select for CLEARFIELD resistant plants and reduces the risk of contamination from volunteer or non-resistant wheat.
CLEARFIELD wheat varieties are not GMOs.
No foreign DNA was inserted into the wheat plant during development of CLEARFIELD wheat varieties. CLEARFIELD varieties are not genetically modified organisms (GMOs). There are no restrictions on production or marketing of grain from any CLEARFIELD wheat variety.
Author: Russ Karow, Oregon Ste University, September, 2004
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