Efficacy and potato crop safety with two metribuzin 75 PF brands applied preemergence or early postemergence

摘要

The objective of this trial was to compare weed control and potato crop safety with various rates of a generic formulation of metribuzin 75 DF marketed by Cheminova Inc. vs Sencor 75 DF~R applied preemergence (PRE) or early postemergence (EPOST). Thetrial area was fertilized on April 21, 2008 before planting with 140 lb N, 145 lb P_2O_5, 30 lb S, and 4 lb Zn/A based on soil tests and received additional N injected through the sprinkler system on July 15 and August 1, 2008. 'Russet Burbank' potatoeswere planted on April 28, 2008 5 inches deep at 12-inch intervals in rows spaced 36 inches apart in a Declo loam soil with 1.5% organic matter and pH 8.0. Potatoes were hilled and 0.27 lb ai/A imidacloprid was applied on May 17, 2008, prior to potato emergence. Treatments were arranged in a randomized complete block design with three replications and plot size of 12 by 30 ft.