Since ca. 1890, applied entomologists throughout the world have been introducing exotic natural enemies to obtain classical biological control. Recently, C. P. Clausen and coworkers prepared a summary of this phase of biological control (Clausen 1978) which treats the subject on a worldwide basis up to 1968. In the present paper, we present an analysis of data obtained from this volume, viz., rate of establishment of natural enemies in classical biological control.
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Hall et al. (1979) studied this question.
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