Abstract
SUMMARY Pathogenicity tests with forty‐nine isolates of Phytophthora fragariae , cause of red core disease of strawberry, using the strawberry varieties Huxley, Perle de Prague, Climax, Talisman, Aberdeen and Cambridge Vigour, revealed the existence of twelve physiological races of the fungus on the basis of a pathogenic or non‐pathogenic reaction. Further differentiation, on the basis of degree of pathogenicity to Perle de Prague and to Climax, allowed the recognition of nineteen races. Varying the concentration of zoospores used as inoculum, and the length of inoculation period, which did not affect the relative pathogenicities of two isolates tested, had greater effects on the level of invasion with a highly pathogenic isolate than with a slightly pathogenic one. Amongst the isolates differences uncorrelated with other characters such as pathogenicity were demonstrated in growth characters in agar culture and in abundance of zoospore production.
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Claims 5
Claim · model-written summary
Pathogenic reactions identified twelve races on strawberry.
- Taxon
- strawberry
_single2.jpg?width=60)
Fragaria ×ananassae0 - Outcome
- twelve physiological racese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_single2.jpg?width=500)
Verbatim
e0“using the strawberry varieties Huxley, Perle de Prague, Climax, Talisman, Aberdeen and Cambridge Vigour, revealed the existence of twelve physiological races of the fungus on the basis of a pathogenic or non‐pathogenic reaction.”
Claim · model-written summary
Degree of pathogenicity to two varieties resolved nineteen races.
- Outcome
- nineteen racese0
Not reportedTaxonDirection
Verbatim
e0“Further differentiation, on the basis of degree of pathogenicity to Perle de Prague and to Climax, allowed the recognition of nineteen races.”
Claim · model-written summary
Inoculum concentration and duration did not change relative pathogenicity of two isolates.
- Treatment
- Varying the concentration of zoospores used as inoculume0
- Outcome
- relative pathogenicities of two isolatese0
- Direction
- did not affecte0
Not reportedTaxonComparator
Verbatim
e0“Varying the concentration of zoospores used as inoculum, and the length of inoculation period, which did not affect the relative pathogenicities of two isolates tested”
Claim · model-written summary
Inoculum concentration and duration affected invasion more for the highly pathogenic isolate.
Not reportedTaxon
Verbatim
e0“had greater effects on the level of invasion with a highly pathogenic isolate than with a slightly pathogenic one.”
Claim · model-written summary
Isolates differed in agar growth independently of pathogenicity.
- Outcome
- growth characters in agar culturee0
Not reportedTaxonDirection
Verbatim
e0“Amongst the isolates differences uncorrelated with other characters such as pathogenicity were demonstrated in growth characters in agar culture and in abundance of zoospore production.”