Appendix to the Journals of the Senate and Assembly of the ... session of the Legislature of the State of California

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Pseudomonas syringae ssp. savastanoi ("Bacillus oleae") Identifier: appendixtojourna19033cali (find matches)
Title: Appendix to the Journals of the Senate and Assembly of the ... session of the Legislature of the State of California
Year: 1853 (1850s)
Authors: California. Legislature
Subjects: Legislative journals
Publisher: Sacramento : State Printing
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library

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e writings denote. Trees have been entirely destroyed by it in threeor four years after planting, but these cases undoubtedly had it whenplanted. The inspections have covered fully 400,000 olive trees in a dozenwidely separated localities, and constantly I have found Missions grow-ing among or alongside infected trees of the other varieties, and mostlyunaffected. In most cases they were grown in the same nursery as theinfected trees, shipped together in the same car (often in the samebales), were cultivated and pruned by the same set of tools, and other-wise exposed in every possible, practical way to orchard or nurseryinoculation. Though Professor Biolettis experiments have shown beyonda question the possibility of forced inoculations (see Report of StateBoard of Horticulture, 1899), I think this multitude of evidence ispretty conclusive that the Mission is at least strongly, practicallyresistant, though not actually immune. I know one orchard of Missions OLIVE-KNOT IN CALIFORNIA. 71
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Plate III. Fully Developed Case of Olive-Knot (Bacillus olece) on Branch. 72 REPORT OF STATE BOARD OF HORTICULTURE. growing—entirely unaffected —alongside several hundred trees of Rubra,every tree of which latter is affected, many of them killed. There aretrees with literally tens of thousands of knots, in most active stages ofdevelopment, standing only a few feet from the Missions, and, as in theother cases, both varieties have had a common nursery origin, and havebeen shipped, pruned, and cultivated in common, and the Missionsthereby exposed to every possible practical infection. Attention was first directed to this disease in the United States byProfessor Newton B. Pierce, of Santa Ana, who published a descriptionof it in the Journal of Mycology in 1891. During his researches inEurope, Professor Pierce found the disease quite common in some sectionsaround the Mediterranean, and drew the attention of California to itsdanger. In his report he says: The tubercle of the olive is an

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