Insects can cause injuries to plants at every stage of life and can be noticed in every stage of growth, from seed to finished product. The insect attack continues even during storage and after use. Therefore it is important to adopt preventive measures against insects to minimise the damage and increase the productivity of trees. Multiplication of an insect in numbers beyond the level when it becomes a pest can be prevented by following control methods.

1. By cultivating different tree species in different ways

2. By use of their natural enemies

3. By hand collection and destruction

4. By trapping

5. By preventing their laying of eggs

6. By use of chemicals to reduce the numbers of insect pests