Evaluation of chemical treatments on pear, '70, '71
AuthorsJ. A. Beutel
W. J. Moller
W. O. Reil
L. B. Fitch
D. H. Chaney
Authors AffiliationsL. B. Fitch is Farm Advisor, Sutter County; D. H. Chaney is Farm Advisor, Yuba County.
Hilgardia 27(6):3-4. DOI:10.3733/ca.v027n06p3. June 1973.
Fireblight, caused by the bacterium Erwinia amylovora, was more severe in Sacramento Valley pear orchards during 1970 than any time in the previous 20 years. Following the warm winter of 1969-70, the regular pear bloom was prolonged for approximately a month with first bloom March 16 and petal fall ending in mid-April. “Rat-tail” (late season) bloom continued for several weeks during May and June. During much of this period, weather conditions favoring blight were ideal with temperatures over 65°F, and frequent rains. First widespread fireblight infections were observed in the Sacramento Valley between April 18-21, continuing through May and June.
Also in this issue:Reorganization of University of California's agricultural experiment station
Streptomycin-resistant control studies, 1972
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