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One of the major difficulties in the biological control of insect pests is the

1. practical difficulty of introducing the predator to specific areas
2. method is less effective as compared with the use of insecticides
3. predator does not always survive when transferred to a new environment
4. the predator develops a preference to other diets and may itself become a pest

Correct answer: predator does not always survive when transferred to a new environment

Solution

Biological control depends on the introduced predator or parasite establishing itself in the target area. A major difficulty is that it may not survive the new climate, food conditions, or ecological pressures, so control fails.

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