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PEST CONTROL BY BIOLOGICAL MEANS 
Richard L, Doutt, Chairman, Division of Biological Control, 
University of California, Berkeley 
Unilateral approaches to pest control are 
yielding to broad, multidisciplinary attacks 
on noxious organisms, Changing attitudes are 
an obvious concomitance, and as a result 
58 
many concepts 
that were merely abstract 
ideas only a few years ago are now being 
put to field tests in an ingenious and imagi- 
native fashion, The once limited and restricted 
