Disseminating organisms of plant disease and making wounds through which other harmful organisms may enter. Physical control would include the direct removal of insects, by interrupting their physiological processes, prevention of their entry into an area, or physically destroying them with machinery. Cultural control can prevent pest damage. Soil tillage and removal of crop residues to reduce insects' food supply. Early or delayed planting can lessen the amount of food available when the insect is in its larval stages.
Biological control is the use of other insects or pathogens to control economic pests.
Some parasites deposit eggs on their victim. The larvae then consume the pest. Purple scale of oranges controlled by wasps. Predators kill and consume pests. Lady bird beetles and their larvae eat aphids.