Abstract
Summary A survey was made over 5 years of the incidence of contamination by Phoma foveata and Polyscytalum pustulans on 3‐year‐old virus‐tested stem cutting (VTSC) stocks assessed on three occasions during the storage season, and on their daughter tubers at five farms. The contamination occurring on plants grown in small plots from stem‐cutting/microplant tubers was also assessed at the farms. Fungicide treatment soon after harvest reduced the incidence of both pathogens, especially P. pustulans . Tuber contamination was similar for samples collected after fungicide treatment and before planting. The incidence of contamination on daughter tubers, relative to that on the untreated mother tubers, was less with P. foveata but was similar or greater with P. pustulans . Contamination by both pathogens varied between farms and was reflected in the degree of contamination occurring on daughter tubers from stem‐cutting/microplant tubers. The incidence of P. foveata on stems, soil and tubers of seed stocks classified at Foundation Stock grade from various regions of Scotland was assessed over 2 years. The incidence of tuber contamination was correlated ( P < 0.05) with the amount of tuber‐borne soil contamination for all comparisons, but was correlated with stem inoculum in only 7 out of 13 comparisons. The largest amounts of stem inoculum of P. foveata were found in stocks in Aberdeenshire. These results are discussed in relation to the spread of both pathogens to healthy VTSC stocks.
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Claims 9
Claim · model-written summary
Postharvest fungicide reduced Phoma foveata contamination.
- Taxon
- seed potato tuberst0
- Treatment
- Fungicide treatment soon after harveste0
- Interactor
- Phoma foveataBoeremia foveatat0pathogen
- Outcome
- incidence of both pathogense0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“Fungicide treatment soon after harvest reduced the incidence of both pathogens, especially P. pustulans .”
t0“Contamination of seed potato tubers grown from stem cutting or microplant‐derived tubers by Phoma foveata and Polyscytalum pustulans”
Claim · model-written summary
Postharvest fungicide reduced Polyscytalum pustulans contamination, especially strongly.
- Taxon
- seed potato tuberst0
- Treatment
- Fungicide treatment soon after harveste0
- Interactor
- P. pustulansPolyscytalum pustulanse0pathogen
- Outcome
- incidence of both pathogense0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“Fungicide treatment soon after harvest reduced the incidence of both pathogens, especially P. pustulans .”
t0“Contamination of seed potato tubers grown from stem cutting or microplant‐derived tubers by Phoma foveata and Polyscytalum pustulans”
Claim · model-written summary
Tuber contamination was similar after fungicide treatment and before planting.
Verbatim
e0“Tuber contamination was similar for samples collected after fungicide treatment and before planting.”
t0“Contamination of seed potato tubers grown from stem cutting or microplant‐derived tubers by Phoma foveata and Polyscytalum pustulans”
Claim · model-written summary
Daughter tubers had less P. foveata contamination than untreated mother tubers.
Verbatim
e0“The incidence of contamination on daughter tubers, relative to that on the untreated mother tubers, was less with P. foveata but was similar or greater with P. pustulans .”
t0“Contamination of seed potato tubers grown from stem cutting or microplant‐derived tubers by Phoma foveata and Polyscytalum pustulans”
Claim · model-written summary
Daughter tubers had similar or greater P. pustulans contamination than untreated mother tubers.
Verbatim
e0“The incidence of contamination on daughter tubers, relative to that on the untreated mother tubers, was less with P. foveata but was similar or greater with P. pustulans .”
t0“Contamination of seed potato tubers grown from stem cutting or microplant‐derived tubers by Phoma foveata and Polyscytalum pustulans”
Claim · model-written summary
Contamination by both pathogens varied between farms and was reflected in daughter tubers.
Verbatim
e0“Contamination by both pathogens varied between farms and was reflected in the degree of contamination occurring on daughter tubers from stem‐cutting/microplant tubers.”
t0“Contamination of seed potato tubers grown from stem cutting or microplant‐derived tubers by Phoma foveata and Polyscytalum pustulans”
Claim · model-written summary
Tuber contamination correlated with tuber-borne soil contamination.
- Taxon
- seed potato tuberst0
- Interactor
- Phoma foveataBoeremia foveatat0pathogen
- Outcome
- incidence of tuber contaminatione0
- Comparator
- amount of tuber‐borne soil contaminatione0
Not reportedDirection
Verbatim
e0“The incidence of tuber contamination was correlated ( P < 0.05) with the amount of tuber‐borne soil contamination for all comparisons”
t0“Contamination of seed potato tubers grown from stem cutting or microplant‐derived tubers by Phoma foveata and Polyscytalum pustulans”
Claim · model-written summary
Tuber contamination correlated with stem inoculum in seven of thirteen comparisons.
- Taxon
- seed potato tuberst0
- Interactor
- Phoma foveataBoeremia foveatat0pathogen
- Outcome
- correlated with stem inoculume0
- Value
- 7 out of 13 comparisonse0
- Comparator
- stem inoculume0
Not reportedDirection
Verbatim
e0“but was correlated with stem inoculum in only 7 out of 13 comparisons.”
t0“Contamination of seed potato tubers grown from stem cutting or microplant‐derived tubers by Phoma foveata and Polyscytalum pustulans”
Claim · model-written summary
Largest P. foveata stem inoculum amounts were in Aberdeenshire stocks.
Verbatim
e0“The largest amounts of stem inoculum of P. foveata were found in stocks in Aberdeenshire.”
t0“Contamination of seed potato tubers grown from stem cutting or microplant‐derived tubers by Phoma foveata and Polyscytalum pustulans”
The same questions in other papers
fungicide · Polyscytalum pustulans · Solanum tuberosum (potato)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.