Submitted to: Potato Association of America Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 6/1/2003
Publication Date: 8/10/2003
Citation: HUTCHINSON, P., BEUTLER, B.R., BOYDSTON, R.A., RANSOM, C.V., FLETCHER, F.E. DIMETHENAMID-P, SULFENTRAZONE, AND FLUMIOXAZIN: THREE NEW PREEMERGENCE HERBICIDES FOR WEED CONTROL IN POTATO. POTATO ASSOCIATION OF AMERICA PROCEEDINGS. 2003. G55, p. 48.
Technical Abstract: Dimethenamid-p, sulfentrazone, and flumioxazin are three preemergence herbicides being developed for use in potato. Efficacy and potato variety tolerance trials were conducted over a multi-year period in Idaho, Oregon, and Washington. All three herbicides improved season-long hairy nightshade control when combined in two-way tank mixtures with standard preemergence herbicides, such as EPTC, metribuzin, pendimethalin, rimsulfuron, or s-metolachlor, compared to those standard herbicides applied alone. Depending on year and location, common lambsquarters, kochia, and grass control also was improved with two-way mixtures including one of these developmental herbicides compared to standard herbicides applied alone. Russet Burbank potato variety was tolerant to one and two times the proposed dimethenamid-p label rate in trials conducted in Idaho and Oregon. Russet Burbank, Russet Norkotah, Ranger Russet, Shepody, Alturas, and Bannock Russet potato varieties were tolerant to one and two times the proposed dimethenamid-p, sulfentrazone, or flumioxazin label rates in Idaho and Washington trials, depending on year and location. When grown during heat stress conditions, most varieties were less tolerant to sulfentrazone or flumioxazin, compared to varieties grown during average growing conditions.