Calico scale on walnuts: Problem of soft scales on walnut increasing but natural enemies still exert suppressing influence on calico scale
A. E. Michelbacher, University of California, Berkeley.
Stephen Hitchcock, University of California, Berkeley.
California Agriculture 10(9):6-6. DOI: 10.3733/ca.v010n09p6.
Abstract Not Available – First paragraph follows:
The Audubon's warbler and a wasp parasite work together to hold the calico scale—potentially destructive on walnuts —under control. This occurs even under conditions where—because of the tendency of the newer insecticides to interfere with natural enemies—other un-armored scale population has increased.
A. E. Michelbacher is Professor of Entomology, University of California, Berkeley. Stephen Hitchcock is Research Assistant in Entomology, University of California, Berkeley.
The earlier investigations which revealed that the Audubon's warbler attacks the calico scale were made by Homer Lowe, at that time Entomologist with the Anderson Ranch, Linden.