Repeated cultivation of the same crop like paddy results in a huge food reserve to a given pest, which encourages a rapid growth of the pest population. Any change in the crop would create a deficit in its food supply which results in a considerable mortality. Sometime a given pest population may be wiped out [...]

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Systemic Insecticide: Insecticides that get into the body with food and affect different systems. e.g., Lead Arsenate, NaF. Contact Insecticide: Insecticides that kill the insect on contact through toxic effects. e.g., BHC, DDT, Aldrin.

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Insecticide: Chemical agents used for destroying insects. eg. DDT. Pesticide: Chemicals meant for destruction of pests of any kind. e.g., Endrine, Drimecron etc. Fumigation: The method of pests control through fume of some specific pesticides. Fumigants. e.g., Methyl Bromide.

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