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One of the major difficulties in the biological control of insect pests is the
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- practical difficulty of introducing the predator to specific areas
- method is less effective as compared with the use of insecticides
- predator does not always survive when transferred to a new environment
- the predator develops a preference to other diets and may itself become a pest.
Correct Option: D
Biological control refers the use of living organisms like natural predators and parasites to reduce pest population and control diseases. However they may become pest as they can develop a preference to other diets.
