NDSU Crop and Pest Report

ISSUE 12   July 22, 2004


The "North Dakota Noxious and Troublesome Weed Guide" has been revised and re-released by Rod Lym, Professor of Weed Science at NDSU. The guide includes photos of 28 weedy or troublesome weeds including all the those on the state noxious weed list. Several native species are included that are generally not considered weedy but are often mis-identified as weeds such as wavy leaf thistle, flodman thistle, and golden rod. Troublesome weeds included poison ivy, common ragweed, dames rocket, and swamp ragwort.

The guide is 4 by 5 3/4 inches for easy carrying. There are photos of the mature plants as well as close-ups of key distinguishing characteristics such as flowers, leaves, and seeds. The guide is available at your local NDSU County Extension Service office and costs $4 per copy.



RU Original Max, RU UltraMax, RT Master II (Monsato)

Mode of action: EPSP synthase inhibitor
a.i.: glyphosate
Crops: Preharvest in field pea, chickpea and lentil
Comments: Monsanto has issued supplemental labels for products listed above for preharvest use in field pea, chickpea, and lentil. These are in addition to glyphosate products already labeled and listed on page 31 and 33 of 2004 ND Weed Control Guide. Monsanto expects more glyphosate products registered soon for preharvest use on flax. There is a possibility that preharvest glyphosate labels will be issued for dry beans yet this summer.

Journey (BASF)

Mode of action: ALS inhibitor and EPSP synthase inhibitor
a.i.: imazapic + glyphosate
Crops: grassland
Comments: New for 2004. A combination of of imazapic (Plateau) 8.3% + glyphosate 21.94% for burndown weed control plus soil activity resulting in better broadleaf weed control in the convenience of a premix. Uses are for site preparation, seedhead suppression and selective weeding in warm season grasses. Will be sold in the normal distribution channels.

Paramount (BASF)

Mode of action: Growth regulator
a.i.: quinchlorac
Crops: Noncropland, pasture and rangeland
Comments: The livestock grazing and haying restriction differ when treating for field bindweed and leafy spurge. For field bindweed the label can be confusing because it restricts livestock grazing in treated areas, then in another sentence restricts grazing for 309 days and in another sentence restricts feeding treated forage, grasses, hay, .... to livestock. The 2004 ND Weed Control guide says "Do not use on pasture and rangeland areas to be grazed or cut for hay."

There is a supplemental label for roadsides, fencelines, rights-of-ways, and noncropland that reduces three lines of the federal label to read, "Do not graze or harvest hay from treated areas within 309 days after application." Nothing is said about allowing to feed the hay. This is the way the Overdrive label reads and the reason for the wording on the weed guide. The supplemental label also includes field bindweed so the weed guide will be revised next year to include the same wording. The 309 day grazing/haying restriction essentially makes Paramount difficult to use. The only logical use then would be in areas such as the Corp. of Engineer land and the Theodore Roosevelt National Park.

Plateau (BASF)

Mode of action: ALS inhibitor
a.i.: imazapic
Crops: Government land
Comments: BASF is changing the distribution strategy for Plateau herbicide away from the traditional distribution to only sales to government customers. Plateau can still be applied to private lands as long as it is purchased by government customers. Since most Plateau use in ND has been by government agencies, this will affect few people.


Mode of action: Contact
a.i.: acetic acid
Crops: Non-crop or preemergence to the crop.
Comments: Studies in Canada show that at least 10% acetic acid applied at volumes equal to or greater than 170 gallons/A were required to provide weed control to commercial standards. Some weed regrowth occurred due to the contact nature of the product. Some acetic acid treatments injured wheat but symptoms disappeared at 28 days after application. The cost of acetic acid at 10% strength applied at 170 GPA was estimated at $130/A (Canadian). Pretty spendy!

Richard Zollinger
NDSU Extension Weed Specialist

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