The relation of pear psylla to pear decline … greenhouse tests
D. D. Jensen, University of California
W. R. Erwin
California Agriculture 17(1):2-4. DOI: 10.3733/ca.v017n01p2.
D. D. Jensen is Professor and Entomologist in the Experiment Station, University of California, Berkeley; W. R. Erwin is Laboratory Technician III, Department of Entomology, U.C., Berkeley.
Extensive research by U.C. entomologists, in both greenhouse and field test plots, on the relation of insects to the cause or spread of pear decline disease indicates that the pear psylla, Psylla pyricola Foerster, is the key to the problem.
The following graduate students assisted in this research program: P. Cook, C. Gemignani, M. Shapiro, and H. L. Wilson.