Symptomatic and etiologic relations of the canker and the blossom blast of Pyrus and the bacterial canker of Prunus
AuthorEdward E. Wilson
Author AffiliationsEdward E. Wilson was Assistant Plant Pathologist in the Experiment Station.
Hilgardia 10(8):213-240. DOI:10.3733/hilg.v10n08p213. November 1936.
Abstract does not appear. First page follows.
In 1931 a heretofore undescribed bacterial canker of pear trees was found in Sierra Nevada foothill orchards. A brief discussion of symptoms, giving results of inoculations and comparing the disease with fire blight, Erwinia amylovora (Burrill) Bergey et al., was published in 1934.(18)3 The causal organism was not described except as it differed from Erwinia amylovora in producing a greenish pigment on many media, thus allying itself with Phytomonas cerasi (Griffin) Bergey et al., cause of the stone-fruit bacterial canker.(17)
A blossom blast of pear in California differing from that caused by fire blight was briefly described by Thomas and Ark,(15)4 who report the causal organism as similar to those of citrus blast and stone-fruit canker.
The orchards in which the writer first found the limb-canker disease have remained free of blossom blast, though planted with Beurre Bosc, a variety elsewhere susceptible to blossom infection. Limb and blossom symptoms in the trees growing in other districts indicate that all are phases of the same disease. One purpose of this work, therefore, was to compare the bacteria obtained from these parts of the host.
Reports from New York(3),(4) and Arkansas(9),(10) regarding infection of pear leaves, fruit, and blossoms by bacteria possessing cultural characteristics similar to these organisms were additional reasons for the study.
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Citrus rejuvenation studies: Three basic soil treatments used in orchard investigations to determine best conditions for root growth and development
Drift of 2,4-D applied by plane: Better knowledge of wind direction and velocity as factors in drift contributes to reduction in number of damage suits
Isopropyl available for citrus: Registration of the isopropyl ester specifically for use as plant growth regulator on citrus permits this form of 2,4-D
Temperatures and frost damage: Measurements of temperature inversions and blossom counts show extent of frost damage in tests in deciduous orchards
Plant response to polluted air: Specific effects of air pollutants on plants vary according to plant species and modifying internal and external factors
Nutrition of date seedlings: Glasshouse tests with Deglet Noor variety in sand and soil cultures indicate which nutrients best stimulate growth
Boron deficiency of grapes: Soil application at one ounce of borax per vine supplies enough boron for normal growth after midwinter pruning
Caterpillar damage to tomatoes: Results based on one-year survey indicate no evidence of resistance to insecticides in nine commercial tomato fields
Inheritance of resistance to powdery mildew in beans
Spotted wilt of the sweet pea