Patent ID: 8959832
Filing Date: 2015-02-24
Classification: A01N

Abstract:
1. A sheet material for preventing entry of unwanted roots into a volume of soil, comprising a flexible carrier sheet of a non-biodegradable polymeric material; discrete spaced-apart layered segments of a polymer containing a dinitroaniline herbicide positioned on a front surface of the carrier sheet, leaving an uncoated exposed surface of the carrier sheet in between the spaced-apart layered segments, the layered segments comprising a composition effective to retain and control the release rate of said herbicide; the layered segments having outer surface portions thereof coated with a layer of barrier material that blocks diffusion of the herbicide directly from the portions of the layered segments that are coated with the barrier material, leaving uncoated sides of the layered segments from which the herbicide is released during use, and including layers of said barrier material on those portions of the segments facing a back side of the carrier sheet, for dispersing the herbicide at a controlled release rate directly away from the uncoated sides of the layered segments on the front surface of the carrier sheet, together with blocking release of the herbicide away from the back side of the carrier sheet.