Explain the methods of controlling insect pests.

Controlling insect pests:

(i) Root cutting type of insects is controlled by mixing insecticides in the soil.
Example - Chloropyriphos.

(ii) Stem and leaf cutting type of insects can be controlled by dusting or spraying the contact insecticides.
Example - Malathion, Iindane and thiodan.

(iii) All sap sucking insects can be controlled by spraying systematic insecticides.
Example - Dimethoate and metasystox.