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Broccoli crowns harvested from a sweet potato whitefly trial. The chlorotic “blanched” crown on the right was harvested from a plant heavily infested with whiteflies. The green “normal” crown on left was whitefly-free.  (Photo by John Palumbo) Broccoli crowns harvested from a sweet potato whitefly trial. The chlorotic “blanched” crown on the right was harvested from a plant heavily infested with whiteflies. The green “normal” crown on left was whitefly-free.