ISSUE 9 July 5, 2007
APPLICATION TIMING OF GLYPHOSATE IN ROUNDUP READY CORN AND RR CORN 2
The maximum in-crop single application use rate in RR corn is 22 fl oz/A and is 32 fl oz/A in RR corn 2. The maximum in-crop total application amount in RR corn is 1.4 qt and is 2 qt/A in RR corn 2. The maximum RR corn/2 height for glyphosate application is 24 inches and drop nozzles recommended for 24 to 30 inch corn.
EXPANDED ACETOCHLOR CROP ROTATION OPTIONS
The long awaited approval to allow additional crops to be planted after acetochlor has finally happened. Acetochlor soil-applied in corn provided equal or greater grass and broadleaf weed control in North Dakota than other acetanilide herbicides. Dow recently received EPA approval on a series of acetochlor supplemental labels (Surpass) that expand crop rotation options. Monsanto has received approval from the EPA for additional rotation crops for Harness and is in the process of securing final EPA and state approvals. Acetochlor is no longer classified by EPA as Restricted Use pesticides. Previously, corn could be planted anytime after a Surpass or TopNotch application; soybean, sorghum, and tobacco could be planted the following spring; and wheat could be planted after 4 months.
The new acetochlor supplemental labels (Surpass is available on cdms.net) allow the following crops to be planted the spring following application: alfalfa, barley, buckwheat, clover, dry beans (adzucki, kidney, lima, navy, pinto), lentil, lupin, millet, field pea, potato, rye, sorghum, soybean, sugarbeet, triticale, and vetch. Some other crops not common to North Dakota are also rotational options. Snap beans and green peas are not allowed as rotational crops.
It is assumed that supplemental labels of other generic acetochlor formulations will be issued to reflect these approved rotation crops.
BAYER CROPSCIENCE AND MONSANTO ENTER LONG-TERM BUSINESS AND LICENSE AGREEMENTS
Bayer CropScience AG and Monsanto Company, two of the leading agro-companies worldwide, have entered into a series of long-term business and licensing agreements. Among these, Bayer CropScience will grant Monsanto a royalty bearing, non-exclusive license for its LibertyLink herbicide tolerance technology for use in corn and soybeans, the two largest field crops in terms of acreage in the United States.
The agreements provide Monsanto with an option to market corn and soybean seeds which contain both Monsanto's Roundup Ready® and Bayer CropScience's LibertyLink® technologies. Monsanto and Bayer CropScience also amended certain existing agreements in the area of herbicide tolerance to provide each other more favorable terms. In addition, the companies amended other agreements related to insect-protection technologies, including Monsanto's existing non-exclusive, royalty-bearing license for use of Bayer CropScience's Dual Bt technology.
As part of the agreements, Monsanto and Bayer CropScience cross-licensed each other under their respective patent estates for RNAi technology, an important enabling technology for the development of new agricultural products.
HALEX RELEASED HERBICIDE NAME FOR GT CORN
Halex GT contains mesotrione (Callisto), s-metolachlor (Dual II), and glyphosate (Touchdown Hi-Tech) and applied early postemergence controls several emerged weeds with residual activity, including ragweeds, waterhemp, lambsquarters and pigweeds, including control of weed biotypes tolerant or resistant to ALS, triazine and glyphosate herbicides. Halex GT does not contain atrazine.
Halex GT will be included in university and in-house trials across the Corn Belt in 2007 allowing an opportunity to compare this treatment with other weed control programs. The EPA registration for Halex GT is expected in time for a full commercial launch in 2008.
EXPRESS SUN SUNFLOWER
Express Sun sunflowers has been registered and Express herbicide (with TotalSol soluble graules - 50% ai not 75% ai) has been labeled for application only to sunflower hybrids with the ExpressSun trait.
Apply Express at a rate of 0.25 to 0.5 ounce per acre. Add an MSO at 1% v/v. Apply Express when the ExpressSun sunflowers are in the 1 leaf but prior to beginning of bud formation. Depending upon rainfall or other environmental conditions, annual weeds may have multiple flushes of germinating seedlings. Express can be applied a second time, 14 or more days after the first application. The combined rate of the postemergence applications cannot exceed 1.0 oz/A per use season. Apply with a registered grass herbicide for POST grass control. However, grass antagonism may occur from the Express herbicide. To overcome grass antagonism, apply the grass herbicide at least one day before, or seven days after, the application of Express. Cultivation is not recommended for 7 days after application.
NDSU Extension Weed Specialist