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Master of Science (MS)



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The potato psyllid, Paratrioza cockerelli (Sulc) as stated by E. O. Essig, (1917) is a native of the western states.

Since the great outbreak of psyllid yellows in Utah potato fields in 1927 much interest has been given to this insect. The close relationship between the nymphs of P. cockerelli and the disease, psyllid yellows, is a well known fact, but as yet the causative factor by which this disease is produced still remains unknown.

Because of the serverity of the disease to potatoes and the importance of knowing something of the host plants of P. cockerelli, the writer, upon the suggestion of Dr. G. F. Knowlton, began a study to, so far as possible, determine the uncultivated and cultivated host plants of this insect. The native plants of the solanaceous group used in these experiments were collected from Utah; other species of the potato family used were obtained from Dr. S. P. Doolittle of the U. S. D. A. Bureau of Plant Industry; Professor F. G. Weber, of the Florida Agricultural Experiment Station; and Dr. R. W. Samson of the Purdue University.



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