Streptomycin-resistant control studies, 1972
AuthorsW. J. Moller
J. A. Beutel
W. O. Reil
F. J. Perry
Authors AffiliationsF. J. Perry was Farm Advisor, Butte County.
Hilgardia 27(6):4-5. DOI:10.3733/ca.v027n06p4. June 1973.
Asevere outbreak of fireblight occurred in Bartlett pear orchards in the northern Sacramento Valley during 1971. It developed in orchards where growers had followed a thorough blight control program using streptomycin sprays (12 to 18 applications per season) exclusively during 1970 and 1971. Blight samples from these orchards were collected and checked for streptomycin resistance in May 1971. The pathogen in many of these samples was shown to be highly resistant to streptomycin. This newly developed resistance to streptomycin in the Sacramento Valley apparently accounted for the failure to control blight in 1971 with streptomycin programs that had performed successfully in 1970.
Also in this issue:Reorganization of University of California's agricultural experiment station
Evaluation of chemical treatments on pear, '70, '71
Effects of control sprays on russetting of Bartlett pears
Use of spray target cards and leaf analysis to measure spray coverage
Nonmercury fungicides for control of seedling disease of cotton
Using organic wastes as nitrogen fertilizers
Diagnosing potassium deficiency by soil analysis
Response of Thompson Seedless grapes to 4-chlorophenoxyacetic acid and benzothiazol-2-oxyacetic acid