Answer: I can't tell if the pest are aphids or whiteflies but both are common in gardens and the control measures are the same. Whiteflies, which are about 1/16th of an inch long and fly on powdery white wings; characteristically they will fly away all at once when disturbed. They are sucking insects and lay their eggs on the undersides of the leaves. A light infestation will probably not hurt your plants, but they can multiply rapidly in warm weather and will attack many types of plants so you may wish to try to control them to some extent. You can hand pick any egg masses you find, then spray with insecticidal soap being sure to follow the label directions carefully. You will need to spray several times to control subsequent hatchings; be sure to cover the undersides of the leaves thoroughly. Another method of non-chemical control is to place yellow "sticky traps" at about the same height as the leaves.
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