Remove and destroy whitefly-infested vegetable plants after harvest. Always inspect new plants for whiteflies and nymphs before introducing them in the greenhouse or garden.

Is there a season for whiteflies?

Whitefly infestations appear so consistently during summers in Southern California inland areas, beginning after the first several weeks of hot weather, you can almost set your calendar by them. This window occurs most years between late July and mid-August, and may persist at least through fall or early winter.

How often should you spray for whiteflies?

Removing a few infested plants early may prevent future problems. High-pressure water sprays will wash away honeydew and sooty mold accumulations and reduce populations of adults and nymphs. High-pressure water sprays are recommended at least once a week for three consecutive weeks and can be repeated as necessary.