Biological control of insects: California's subtropical climate favors establishment of natural enemies of agricultural insect pests
C. P. Clausen, University of Calilornia College of Agriculture
California Agriculture 6(11):10-10. DOI: 10.3733/ca.v006n11p10.
C. P. Clausen is Chairman of the Department of Biological Control, University of Calilornia College of Agriculture, Riverside;
Not available – first paragraph follows:
One third of the 100 or so insects introduced successfully into the continental United States for biological control, are established in California.