Weed control in tomatoes with ShadeOut~(R): a progress report

摘要

The relatively recent registration of tomato herbicide, rimsulfuron (ShadeOut~(R)), adds flexibility to the weed management program in tomatoes. Applied as a post plant/pre emergent herbicide, a timely rainfall or sprinkler irrigation is required for incorporation. Weed control as well as crop safety has been the most consistent with the pre emergent-timed application. Post emergent applications have been attractive either as a follow up treatment or as the primary timed application. Reduction in nightshade infestation has been achieved. Research to improve nightshade control as a post-emergent application has been a target of recent efforts. In a field test in the Dixon area of the Sacramento Valley, ShadeOut was combined with various oils as a post emergent application. Time of application was either at the cotyledon or the 2-true leaf, growth stage of direct seeded tomatoes. The trial was in cooperation with area growers, Timothy and Viguie Farms, in a commercial field of variety BOS 351 on double seed lines per bed. The rate of ShadeOut was 0.5 oz ai per acre in approx 25 gallons of water per acre. The surfactants evaluated were Latron B 1956 at 0.25 percent, HerbiMax at 1 percent, Hasten at 0.25 percent, Tegopren at 0.125 percent or Activator 90 at 0.25 percent. The concentration of the surfactant was on a volume of surfactant to volume of water basis. The plot design was a randomized complete block with 3 replications.