Gly 4 Plus™ Herbicide Gly-4 Plus is a non-selective, postemergent, systemic herbicide that provides broad-spectrum control of annual and perennial weeds, woody brush, and trees. Gly-4 Plus is labeled for use over-the-top of Roundup Ready® corn, cotton and soybeans. Gly-4 Plus is formulated with a full surfactant load and has no soil residual activity. More info...