Purple scale of oranges controlled by wasps. Predators kill and consume pests. Lady bird beetles and their larvae eat aphids. Vedalia beetles have been imported from Australia to control cottony-cushion scale in California and Florida citrus. The bacteria, Bacillus thurengensis, kills butterfly and moth larvae.
Investigation continues on new and innovative applications.
Chemical control usually implies the use of liquids, gases, powders or granules to control insects. Stomach poisons are used to control chewing insects. Contact poisons are used on both chewing and sucking insects. This method implies contacting the insect directly with the chemical. Fumigants are actually poison gasses which enter the insects respiratory system.