One of the major difficulties in the biological control of insect pests is that
Correct answer: D. The predator does not always survive when transferred to a new environment.
- A. The method is less effective as compared with the use of insecticides.
- B. The practical difficulty of introducing the predator to specific areas.
- C. The predator develops a preference to other diets and may itself become a pest.
- D. The predator does not always survive when transferred to a new environment.
Explanation
Insect enemies play an important role in nature for managing the phytophagous insect pests and keep a balance. It is just possible that predators of a particular plant pest are unable to get established and multiply in a particular environment. In such cases, the predators are reared in the laboratory and let off at a particular time when the pests are about to threaten the crops. And then this practice becomes expensive.
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