Insecticides are chemicals that are designed to kill or treat insects.

• Systemic insecticides are those that are designed to be sprayed onto plant material. The chemical then moves through the vascular system of the plant. When insects feed on the plant by sucking out the sap, they are killed by the insecticide in the sap.

• Ovacides are chemicals designed to kill the insect at the egg stage of development.

• Larvicides are those chemicals that are designed to kill the insect in the larval stage of their development.