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Studies in Bacteriosis: Xx. The Spraing Disease of Potato Tubers
Author(s) -
GRIEVE BRIAN JOHN
Publication year - 1934
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.1744-7348.1934.tb06902.x
Subject(s) - biology , rust (programming language) , inoculation , leaf spot , disease , isolation (microbiology) , botany , horticulture , microbiology and biotechnology , pathology , medicine , computer science , programming language
Summary. 1. The disease symptoms generally grouped in England under the designation “spraing or internal rust spot” hare been segregated into two types, namely “arc” lesions constituting spraing disease and “blotch” lesions constituting internal rust spot disease. 2. Isolation experiments have been carried out to see if either of the organisms reputed to be the cause of these tuber necroses ( B. solaniolens and B. rubefaciens ) were constantly present in the lesions. The results show that neither organism occurs in spraing, but that there is some slight evidence that bacteria may be concerned in the production of internal rust spot. 3. Inoculation experiments have been carried out with B. solaniolens and B. rubefaciens . No infection has been produced by B. solaniolens , and though some slight evidence of infection with B. rubefaciens has been obtained the results are far from convincing. 4. Spraing has been transmitted by tuber grafting in three cases out of eighteen, so that the results of Atanasoff have to that extent been confirmed. Spraing was also transmitted in one instance by a ground‐up suspension of the arc lesions. This evidence, together with the absence of any constantly occurring bacterial organism in the lesions, inclines the writer to support Quanjer's view of the virus origin of spraing. Internal rust spot could not be transmitted by tuber grafting. The fact that organisms are more constantly present in the lesions, that B. rubefaciens apparently produced internal rust spot in one experiment, and the failure to transmit this disease by grafting suggest that internal rust spot is a distinct disease from spraing, and may possibly be bacterial in origin. 6. Attempts to isolate a possible infectious principle by leaching from soil after having buffered soil suspensions to different p H values have so far led to no success.