Black blister beetle feeds on the leaves. Applications of Sevin dust control this pest.
Aphids suck plant juices and can build up to fairly heavy infestations. Control aphids with sprays of malathion, rotenone, or acephate.
Leafhoppers carry aster yellows and may be controlled with malathion, Sevin, acephate, rotenone, Diazinon dust, or methoxychlor. .