Some terminologies

Insect: the world “insect” is derived from “insectum” a Latin word which literally mean “notched” or “from the segmented bodies”.

Pest: Any organisms that causes economic damage is pest i.e., any animal or plant causing harm or damage to man, his animals, his crops or possessions even if just causing annoyance. (Hill, 1987).

Management: It is the manipulation of pests to maintain them below economic injury level. It is a way to keep pests below the levels where they can cause economic damage. Management does not mean eradicating pests. It means finding tactics that are both effective and economical and that keep environmental damage to a minimum.

Some facts of insects

• World crop yield losses due to insects is 12.5%, world cereal losses are 13.5% and cereal losses in Asia is 14.0%.
• In 1996, Armyworm outbreak in two V. D. C. of Chitwan (Kumroj and Kathar) which causes 1568 ha damages in rice field.
• In 1987, the rice crop was woefully devastated by an outbreak of armyworms resulting in complete loss in 20% of the total cropping land of Bankey district.