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BACTERIUM SALICIS DAY, THE CAUSE OF THE WATERMARK DISEASE OF THE CRICKET‐BAT WILLOW
Author(s) -
DOWSON W. J.
Publication year - 1937
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1937.tb05851.x
Subject(s) - willow , biology , botany , inoculation , horticulture
S ummary The results of Day's original investigation of the watermark disease of the cricket‐bat willow have been, confirmed by repeated inoculations and reisolations of an organism agreeing with Bacterium salicis Day. The organism has been studied in pure culture and has been compared with a similar bacterium isolated from watermarked white willow from which it differs very slightly. The morphological, cultural and physiological characters of B. salicis are recorded and it is shown that in these respects B. salicis is closely akin to B. tracheiphilus and to a lesser degree to B. amylovorus. A new method is described for the determination of the optimum temperature for growth based upon acid production from sucrose. The author gratefully acknowledges his indebtedness to Prof. Brooks for his interest and helpful criticism throughout, to Mr W. R. Day for assistance in getting into touch with willow growers and to Mr J. Bryce for unstinted co‐operation in the field and for Fig. 1.