Soft scales on walnut in 1956: Increase in soft scale populations on walnuts in northern California effected by several factors in complex problem
A. E. Michelbacher, University of California
Stephen W. Hitchcock, University of California
California Agriculture 11(3):7-14. DOI: 10.3733/ca.v011n03p7.
A. E. Michelbacher is Professor of Entomology, University of California, Berkeley. Stephen W. Hitchcock is Research Assistant, University of California, Berkeley.
Abstract Not Available – First paragraph follows:
Destructive populations of soft scales—frosted scale, Lecanium pruinosum, Coq.; European fruit lecanium, L. corni Bouché: and the calico scale, L. cera-sorum Ckll.—occurred on walnuts in many locations in northern California during 1956.