... variety of broadleaf weeds and aquatic weeds Mode of action: 2,4-D is thought to increase cell-wall plasticity, biosynthesis ... solid, water dispersible granules, and wettable powder. Application Rates: For 2,4-D, rates per application and rates per year are generally ... acre foot for submerged aquatic plants. Application Timing: Timing of 2,4-D application can include at emergence, before bud break, ...