The relation of pear psylla to pear decline … greenhouse tests
AuthorsD. D. Jensen
W. R. Erwin
Authors AffiliationsD. 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.
Hilgardia 17(1):2-4. DOI:10.3733/ca.v017n01p2. January 1963.
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.
Also in this issue:Characters, distribution, and food plants of phlepsid leafhopper vectors of California aster-yellows virus
Orchard tests substantiate: Role of pear psylla in pear decline
Pear psylla: In abandoned orchards
Control of pear psylla: With oils and oil-pyrethrins
Phytotron modification: Admits more sunlight through plastic panels
Vetch green manure increases rice yields: …Proper depth and timing of incorporation allows maximum results
Granulated insecticides superior to sprays for: Alfalfa weevil control
Field maturity—seed yield—shatter loss for: Potomac orchardgrass and hardinggrass
Evidence of nonspecific transmission of California aster-yellows virus by leafhoppers