When is granular 2, 4-D most effective?

Granular 2, 4-D is most effective during the rapid growth of submerged weed roots because this is when the plants are actively taking up nutrients and herbicides. The active growth phase allows the herbicide to be absorbed more efficiently by the weed, leading to a more effective control measure. During this period, the physiological processes within the plant, such as photosynthesis and nutrient uptake, are heightened, which enhances the herbicide's translocation within the plant and increases its efficacy in controlling aquatic weeds.

In contrast, applying 2, 4-D during dormant plant stages, when growth is minimal, would significantly diminish its effectiveness, as the plants may not adequately uptake the herbicide. Similarly, minimal surface coverage reduces the likelihood of the herbicide reaching sufficient concentrations in the target plants, ultimately leading to poor results. While combining herbicides can sometimes enhance efficacy, granular 2, 4-D can be effectively utilized on its own when applied strategically during the right growth conditions.