Orchard tests substantiate: Role of pear psylla in pear decline
AuthorsC. Q. Gonzales
W. H. Griggs
D. D. Jensen
S. M. Gotan
Authors AffiliationsC. Q. Gonzales is Assistant Research Entomologist in the Experiment Station, University of California, Berkeley; W. H. Griggs is Professor and Pomologist in the Experiment Station, U.C., Davis; D. D. Jensen is Professor and Entomologist in the Experiment Station, U.C., Berkeley; S. M. Gotan is Plant Pathologist, California Department of Agriculture, Sacramento.
Hilgardia 17(1):4-6. DOI:10.3733/ca.v017n01p4. January 1963.
Field scale tests with young pear trees last year at Davis provided further evidence that the pear psylla (Psylla pyricola Foerster) plays a central role in the pear decline disease.
Also in this issue:Characters, distribution, and food plants of phlepsid leafhopper vectors of California aster-yellows virus
The relation of pear psylla to pear decline … greenhouse tests
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