Search flower buds, terminal growth and the undersides of lower leaves. Note activity at certain crop stages. Aphids are attracted to some crops at certain growth stages, for example, lilies at the tight bud stage. Pay particular attention to the crop stage if an infestation occurs, and be prepared the next time the same crop hits that growth stage. In later stages of infestation, aphids shed their skin casts on the leaf surface and excrete a honeydew residue on plant foliage that make plants unsightly.
Early detection can be difficult.
Aphids feed in buds and flowers and on the undersides of lower leaves of the plant. Green peach aphids are light green colored and blend in with plant tissue making them hard to see. Winged adults arrive unexpectedly. Winged adult aphids fly in the greenhouse and onto crops from outdoor weeds. Winged adults can be trapped and monitored on yellow sticky cards placed near, vents and doors.