What is one main consideration when timing herbicide applications?

The growth stage of the target plants is a crucial consideration when timing herbicide applications because the effectiveness of herbicides largely depends on the life cycle and development stage of the aquatic plants being targeted. Different growth stages can influence how well a plant absorbs and processes the herbicide. For instance, young, actively growing plants may be more susceptible to herbicides compared to mature plants, which may have developed tolerance or resistance. Applying herbicides when the plants are in their peak growth stage can maximize absorption and therefore effectiveness, leading to better control of unwanted vegetation.

While air temperature, water color, and weather predictions can influence the application process, they do not directly relate to the biological absorption and effectiveness of the herbicide in the target plants. The growth stage provides the most critical window for ensuring that the herbicide will work as intended, thus making it the primary consideration in timing applications.