What is a foliar application?

A foliar application refers specifically to the method of applying pesticides, fertilizers, or other substances directly to the leaves of a plant. This technique is often used to quickly address nutrient deficiencies or pest issues effectively, as leaves can absorb chemicals much faster than roots can uptake nutrients or pesticides from the soil. When a substance is applied to the foliage, it can be absorbed through stomata (tiny pores on leaves) or the leaf surface, allowing for immediate action.

This method is particularly beneficial for targeting specific issues that may arise on the leaves themselves, such as certain insect infestations or fungal diseases, which may not be adequately addressed by applying substances solely to the soil or the roots of the plant. Therefore, the choice identifying a pesticide application made directly to the leaves accurately encapsulates the definition of a foliar application.