What is the term for spraying a plant with pesticide until moisture starts to drip off the foliage?

The term "to runoff" refers specifically to the action of applying pesticide in such a way that excess liquid begins to drip from the leaves of the plant. This technique ensures that sufficient pesticide reaches the plant's foliage and penetrates effectively, as well as potentially reaching areas where pests may be hiding. Achieving runoff indicates that the plant has been adequately treated, allowing for optimal pest control.

The other choices describe related but distinct concepts. "To soak" implies thoroughly wetting the plant but doesn't necessarily convey the specific action of liquid dripping off. "To drench" typically refers to applying a larger volume of liquid, which may or may not result in runoff, while "to saturate" suggests that the plant is fully soaked but does not highlight the droplet aspect that characterizes runoff. By using the term "to runoff," the focus is on the effective application method that ensures coverage and contact with pests.