Asked September 30, 2020, 6:53 PM EDT
Can I put casoron round my walnut trees to discourage grasses and weeds The trees are in a old hay field.
Marion County Oregon
This would not be recommended as Casoron is not labeled for use in walnuts.
Alternative soil-active herbicides would be (not ranked or in any particular order): Alion, Karmex, Trellis, Callisto, Solicam, Surflan, Prowl, Princep, Zeus, Treflan. There are additional options for products with foliar and soil activity.
Please see herbicide table at the back of the Walnut Pest Management Guide: https://catalog.extension.oregonstate.edu/sites/catalog/files/project/pdf/em8421.pdf