When is it most effective to apply foliar sprays?

Applying foliar sprays on fully developed foliage of an actively growing plant is the most effective timing for several reasons. During active growth, plants are metabolizing nutrients and water, which means they are better able to absorb the active ingredients in the pesticide. The cells within actively growing leaves are also more permeable, allowing for enhanced uptake of sprays.

In contrast, using foliar sprays on dormant plants or on plants that are wilting can lead to poor absorption and reduced effectiveness of the pesticide. Dormant plants do not take in nutrients or water as actively, and wilting suggests a lack of turgidity and vitality that further impairs the plant’s physiological processes necessary for effective chemical uptake. The timing of application related to the plant's growth state is crucial for maximizing the benefits of any foliar treatment.