It is important that pesticides are used only where they are absolutely justified. So it is essential that you carefully identify the pest you wish to control and then fully consider all the control options. If you choose to use a pesticide, ensure that it is registered for your target pest in your particular circumstances, and always follow all the instructions on the pesticide label. Pesticides control pest organisms by physically, chemically or biologically interfering with their metabolism or normal behaviour. Most pesticides are lethal to target pests when applied at the rate specified on the pesticide label.
Some pesticides are non-lethal to the target pest.
Contact pesticides have to reach their target directly to be effective. Systemic pesticides move from where they are applied to other parts of the plant to reach their target. The route that brings a pesticide in contact with the target pest depends on the nature of the pesticide, how it is applied and the type of environment in which the pesticide is placed. Common application methods include spraying, fumigating and baiting. Many pesticides are contact pesticides.