Abstract:

Insects are the most diverse species of animals living on earth. Apart from the open ocean,
insects can be found in all habitats; swamps, jungles, deserts, even in highly harsh
environments such as pools of crude petroleum (Imms, 1964). Insects are undoubtedly the
most adaptable form of life as their total numbers far exceed that of any other animal
category. The majority of insects are directly important to humans and the environment. For
example, several insect species are predators or parasitoids on other harmful pests, others are
pollinators, decomposers of organic matter or producers of valuable products such as honey
or silk. Some can be used to produce pharmacologically active compounds such as venoms or
antibodies. Less than 0.5 percentage of the total number of the known insect species are
considered pests, and only a few of these can be a serious menace to people. Insect pests inflict damage to humans, farm animals and crops