How are the pests controlled in a crop field?

Discussion in 'CBSE Class 8 Chemistry Help' started by ramana reddy, Jun 30, 2012.

  1. ramana reddy

    ramana reddy Member

    How and when are insecticides/pesticides sprayed on the fields?
    Or
    How are the pests controlled in a crop field?
    To control the pest population, it is important to spray pesticides at appropriate
    time of life cycle of the pest for example: for grasshoppers and mosquitoes, the rainy season is the best time to spray.
    Selection of appropriate pesticide is also important. The pesticides are generally sprayed
    through various kinds of manual/mechanical sprayer. Knap-sak sprayer (Fig. 1.10) is manually operated and is very common in use these days.

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