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F E B R U A R Y 2 0 1 6 POTATO GROWER 25 Turning Back The Clock A Look Back 25 Years Ago at Excerpts from The February 1991 Issue of The ValleyPotato Grower Magazine Study Of Potatoes Show Lower Rate Of Herbicides Effective Potato Growers can save on herbi- cides without sacrificing yield thanks to research done last sum- mer at the University of Minnesota. Reducing herbicide rates by two- thirds gave excellent weed control and high potato yields says Leonard B. Hertz research and extension horticulturist. Hertz and research scientist Edith Lurvey did the study which Hertz reported on during the annual meeting of the North Central Weed Science Society December 11-13 in Des Moines Iowa. Metribuzin trade names Sencor and Lexone was the herbicide we applied postemergence when pota- to plants were about six to eight inched tall and weeds were about one to four inches tall Hertz says. We were able to reduce the rates drastically to only 0.25 pound metribuzin per acre for 90 percent or better weed control. The key word is postemergence. When metribuzin was applied pre- emergence to the soil surface before the potato plants and weeds had emerged 0.75 to 1 pound of the herbicide was required per acre to give 90 percent or better weed control. One pound per acre is the maximum label rate for metribuzin determined by the Enviromental Protection Agency. Russet Burbank was the variety grown in the study which was con- ducted at the Universitys Sand Plain Research Farm at Becker Minnesota about 50 miles Northwest of the Twin Cities. The weeds to be controlled included green foxtail common ragweed wild buckwheat and carpetweed. Combining the herbicide with a spray additive such as Crop Oil concentrate increased weed control and potato yields to what would have been achieved with 0.75 pound per acre of metribuzin according to Hertz. He says that adding a second herbicide Poast in very small quantities 0.18 pound or a few tablespoonsful in 40 gal- lons of water per acre significantly increased grass control. CERTIFIED SEED POTATOES Contact Kevin Waller 701.402.2833 kevin.wallerblackgoldfarms.com Multi-Year Contracts Available 4320 18th Ave. S. Grand Forks ND 58201 www.blackgoldfarms.com Specializing in Atlantic Snowden Chip Seed. Other RedChipRusset varieties also available.