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CHARLES V. RILEY and L. O. HOWARD.  Experiments with a 
Date-palm Scale.

Insect Life, III, Nos. 11 and 12, August, 1891, pp. 441-445

A number of date-palm trees received in 1890 by the U. S. Department of Agriculture from northern Africa with a view to establish them in California proved to be badly invested with a Scale, Parlatoria zizyphi.  After often repeated treatment with kerosene emulsions of various strengths the scales were finally exterminated without injury to the trees.