ISSUE 12   July 29, 2010


The grazing and haying restriction for Paramount has changed from 309 days before haying and grazing to 0 days for grazing and 7 days for haying. Paramount is listed in the Field bindweed section on page 55 and the Leafy spurge section on page 58 in the 2010 ND Weed Control Guide.



Herbicide mixtures appear to be more effective than rotations in slowing the evolution of herbicide resistance, according to a report in Weed Technology. Herbicide rotation is now the most common form of herbicide resistance management practice among farmers. Although herbicide mixture is common, there are obstacles to its becoming as common as rotation. The authors of this report conducted a four-year study to determine which method more readily slows herbicide resistance evolution.

From 2004 to 2007, two sites of field pennycress co-occurring with wheat in Saskatchewan were treated with an acetolactate synthase (ALS) inhibitor and bromoxynil/MCPA. Treatments consisted of either a mixture of the two compounds or a rotation of them. For the rotation treatment, by the end of four years the level of resistance of recruited seedlings had increased from 29 percent to 85 percent. For the mixture treatment, by the end of four years the level of resistance was similar to that of the nontreated control.

It is hoped that the findings in this study will encourage the herbicide industry to research and develop a broader range of herbicide mixtures to support what farmer surveys and modeling simulations already indicate: mixtures are the superior method for slowing evolution of resistance to herbicides.

The full article can be found at:



The 2008 Pesticide Use Survey is also available on the web and can be found under the "NDSU Weed / Herbicide Surveys" link at the NDSU Weeds web site. The publication has been printed and hardcopies of the publication are available through the NDSU Extension Distribution Center. This is the 8th in a series of pesticide use surveys conducted in ND on a nearly every 4 yr cycle.



Glysortia Inc., based in Hudson, Wis., will source glyphosate produced by suppliers in China, manufactured to a claimed 97% technical standard; above the industry's common 95% standard. Glysortia sources glyphosate from China and can offer both PMIDA and glycine-based supplies as tech, MUP, loaded and light finished goods. Glysortia may supply generic glyphosate and other generic crop inputs may be added in the very near future."



A field test in Montana found that trained detection dogs located spotted knapweed more accurately and at a greater distance than humans, according to an article in the journal Invasive Plant Science and Management.

This weed threatens the survival of native species and can bring about both economic and ecosystem damage. Although dogs and humans were comparable in finding large- and medium-sized plants, the dogs had an edge in locating small plants. The article can be found at:  

Rich Zollinger
Extension Weed Specialist

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