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ISSUE 12   July 20, 2000

 

HERBICIDE UPDATE

    Redeem (Dow) is a new product for a premix containing 2.25 lb ai/gal triclopyr + 0.75 lb ai/gal clopyralid. Redeem is labeled for broadleaf weeds in pasture, rangeland, CRP, roadsides, and other non-crop sites. Rates are 1.5 to 4 pt/A. Redeem controls several annual broadleaf weeds, biennial thistles, Canada thistle, and knapweeds. The product is similar to Confront herbicide that is labeled on turf.

 

WEED CONTROL IN CRP

    The safest approach to controlling Canada thistle control in new spring CRP seedings that is not established is clipping.

    Moderate rates of 2,4-D can be used after grasses reach 5 leaves. Curtail may be applied after grasses have tillered and produced at least 1.5 inches of secondary roots. Bustril is safe on new grasses after the 2 to 3 leaf stage. It is a good option for annual broadleaf weed control but only the top growth of thistle will be affected - new thistle growth will soon emerge. Clarity/dicamba or Tordon can be used for fall follow-up after grasses are fully established. Plateau at 2.5 to 3 oz/A id effective for foxtail but must use on labeled grass species. Alfalfa is tolerant to Plateau. Switchgrass is less tolerant but fields have been treated where switchgrass is one component in a 4 or 5 species mix.

 

SEEDLING WEED ID GUIDE

    Common Weed Seedlings of the Central High Plains is a new ID guide available from Colorado State University. The booklet contains ONLY seedling pictures of over 70 grass and broadleaf weeds. Each weed has two to three pictures in various seedling stages. Some weeds included are: kochia, Russian thistle, lambsquarters, several pigweed species, cocklebur, several nightshade species, purslane, buckwheat, several mustard species, cowcockle, prickly lettuce, sunflower, Canada thistle, ragweed, Venice mallow, redstem filaree, field bindweed, lanceleaf sage, velvetleaf, common mallow, and most
grasses found in ND. Broadleaf weeds are categorized by cotyledon shape and grasses by ligule type.

    Cost is $5.00 + S&H for single copies. Contact Dr. Howard Schwartz, E207 Plant Science, Dept of Biological Sciences, Colorado State University, Fort Collins, CO 80523-1177, 970 491-6987 or refer to the web at:

    http://www.colostate.edu/Orgs/VegNet/csuag/weedbook.html

for ordering information.

 

WEEDS OF THE NORTHERN U.S. AND CANADA

     Weeds of the Northern U.S. and Canada is an excellent weed identification resource for those who identify plants. The feature which makes this book different from most other weed ID guides is the inclusion of a quick-reference section in the front of the book. In this section plants are classified by several characteristics: leaves arrangement, flower color, and cotyledon shape. Over 250 small thumb-nail pictures shows plants either as small seedling or mature plants. With each thumb-nail picture is included a reference in the book where the plant is described at all growth stages with technical information on germination temperature, seed dimensions, plant fertility, weed distribution, and control legislation. Pictures shows several stages of the plant with seed and identifying features. The book has 434 pages and contains more than 750 color photographs and 150 line drawings of 175 weed species from Alaska to Maine and northern California to Virginia.

    The book is available from any B. Dalton Bookstore and cost $21.95 U.S. Authors are France Royer and Richard Dickinson.

 

WEED ID CD-ROM

    CD-ROM: Southern Weed Science Society’s WEEDS of the United States and Canada, Version 2.0 is available for purchase. This interactive CD-ROM contains botanical descriptions, distribution maps and over 2,000 photographs of 362 weeds common to the continental U.S., Canada, and Alaska. Features include interactive quiz exercises in the tutorial, audio narration, plant family descriptions, grass collar illustrations, illustrated glossary, and ability to create and save your own presentations. A unique interactive visual key to identifying seedling grasses has been included. The addition of Larry Mitich’s
(previous NDSU Extension Weed Specialist) "Intriguing World of Weeds" articles provides insight into the impacts and uses of weeds throughout recorded history. This program is a highly useful resource for field agronomists, consultants, extension agents, and for students in all types of courses in the agricultural and biological sciences.

    The CD-ROM cost $120 each and can be ordered from Southern Weed Science Society, 1508 West University Avenue, Champaign, IL 61821-3133. Two or more copies are $108 each. Phone 217 352-4212.

 

HERBICIDE MODE OF ACTION CD-ROM

    The University of MN Extension Service has released a CD-ROM: Herbicide Mode of Action and Crop Injury Symptoms for corn, soybean, small grain and sugarbeet. The interactive CD-ROM combines the benefits of video, slides, and print to teach the basic concepts of herbicide mode of action processes. The CD-ROM helps determine how human decisions and environmental factors affect herbicide effectiveness, crop selectivity, and development of herbicide resistance. Features include: easy navigation of multiple layers of information, more than 500 color photos and images, time-lapse video clips of crop
injury, animation of herbicide and plant interactions, find-it-fast- index that cross-references hundreds of topics, chemical references and trade names, activities to test your understanding , illustrated glossary, crop photo library, and internet connection to Herbicide Mode of Action web sites.

    The CD’s are $40 each for students and non-profits organizations and $80 each for profit organizations. Order through Distribution Center, University of MN, 20 Coffey Hall, 1420 Eckles Avenue, St Paul, MN 55108-6069 or email at:

order@extension.umn.edu.

Phone: 800 876-8636, Fax: 612 625-6281.

Richard Zollinger
NDSU Extension Weed Specialist
rzolling@ndsuext.nodak.edu

 


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