Black scale control: Supply of natural enemy developed by using pest a s foster host on noneconomic plants
Stanley E. Flanders, Experiment Station, Davis.
California Agriculture 3(5):7-14. DOI: 10.3733/ca.v003n05p7.
Not available – first paragraph follows:
Oleanders planted along the side of a citrus orchard—toward the prevailing midday winds—can serve as insectaries for the production of the African parasite, Metaphycus helvolus, a natural enemy of black scale introduced into California in 1937 by the University of California.
Perry T. Cupps is Assistant Professor of Animal Husbandry and Assistant Animal Husbandman in the Experiment Station, Davis.