Symptomatic and etiologic relations of the canker and the blossom blast of Pyrus and the bacterial canker of Prunus

Wilson, E

Symptomatic and etiologic relations of the canker and the blossom blast of Pyrus and the bacterial canker of Prunus

Author

Edward E. Wilson

Author Affiliations

Edward E. Wilson was Assistant Plant Pathologist in the Experiment Station.

Publication Information

Hilgardia 10(8):213-240. DOI:10.3733/hilg.v10n08p213. November 1936.

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Abstract

Abstract does not appear. First page follows.

Introduction

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.

Literature Cited

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