CSS :: Ecology and General Silviculture
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One of the major difficulties in the biological control of insect pests is that:
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[A]. |
The predator develops a preference to other diets and may itself become a pest | [B]. |
They do not always survive when transferred to a new environment
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[C]. |
The method is less effective as compared to the use of insecticides | [D]. |
The practical difficulty in introducing the predator to specific area |
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