Petroleum Spray Oils(PSOs) are effective against citrus mites, scales, white-flies, aphids,psylla and leafminer while they are safe to the natural enemies. The old, broad-range PSOs can easilycause phytotoxicity. With the development of oil formulations, PSOs have become more effective againstpests and safer to plants. They are playing an important role in the integrated management of pests in cit-rus.