Preventive fungicide treatments are needed only in situations where diseases are a yearly problem. Remember to read pesticide labels and always follow label directions. Use products only on the plants listed on the label for a given pest. Also, use products only on the sites listed on the label. The following list includes brief descriptions of some common azalea insect and mite pests.
Aphids are usually more of a problem in greenhouse stock.
Azalea bark scales. Infested plants appear yellowed, often covered with black, sooty mold. Insects are found in the crotches of limbs and on twigs and resemble white, cottony or waxy masses. May. Treat when crawlers are present. Full grown, they are 2 inches long with a red head and legs with broken white stripes.