Absorption occurs through foliage and roots.
Application Methods Viper is a postemergent program and should be applied to actively growing weeds in the cotyledon to 6 true-leaf stage once soybeans have reached the first trifoliate stage. Addition of a non-ionic surfactant and liquid fertilizer solution are required. Viper also provides control of some late-emerging weeds. This information is provided as a public service, but we cannot guarantee that the information is current or accurate. Readers should verify the information before acting on it.