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Although classical biological control can permanently reduce a pest to below the EIL at a very low cost, there?

Although classical biological control can permanently reduce a pest to below the EIL at a very low cost, there is not a very high success rate. What factors can cause failure to establish or control the pest? A. the exotic natural enemy switches hosts B. the weather isn't suitable C. the pest and enemy are not in synchrony D. the crop habitat is not stable enough E. all of the above

Public Comments

1. E: