ACKNOW LEDGMENTS 
Figures 1 and 2 were taken from unpublished data from cooperative studies by Crops 
Research Division and Entomology Research Division, Beltsville, Md. 
Figures 3 and 4 were taken from an unpublished report of Cooperative Regional 
Project NE-36; the investigators were D. E, H. Frear, Pennsylvania State University 
and E, F. Taschenberg and A. W. Avens, New York Experiment Station, Geneva, New 
York, respectively. 
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115 
