Aphids suck plant juices and coat the leaves with sticky honeydew. These insects can be controlled with applications of rotenone, acephate, Sevin, or Diazinon dust.
Mites can be a problem when the plants are grown indoors and out. The leaves of infested plants look dusty, lose their green color and may be covered with fine webbing. The mites will be controlled with applications of Diazinon dust.
Whiteflies are a serious problem on indoor plants. While the plants are outside, spray with acephate.