Coffee Board of Kenya Monthly Bulletins December 1972

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Date
1972
Authors
Patel, R. Z.
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Abstract
Pest control has occupied man since the inception of organized farming.Measures taken by the farmer to improve yield invariably increase availability of food to pests and consequently pest populations rise.Under normal circumstances rise in pest populations is followed by a corresponding rise in their natural enemies which depend for survival on the availability of host insects.Soon the large populations of parasites and predators overwhelm the host or food insect,and as a result,so few of the host insect survive and reproduce that its population declines. This decline continues until the host population is so small that the natural enemy population is itself greatly reduced through depletion of the host insect as food.The stage is now set for an increase in the plant infesting host insect population,which continues until the natural enemies again overwhelm it.The general result is a cyclic population phenomenon.
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