Abstract
Field trials were carried out over a 4 year period (2004–2007) to determine the effect of agronomic factors, specifically cultivar resistance, irrigation, crop duration and chemical control (in‐furrow application of azoxystrobin), on black dot development on potato tubers grown in fields where soilborne inoculum of C olletotrichum coccodes was present. In 2004, 2005 and 2006, two field trials were performed each year and in 2007, 19 mini‐field trials were carried out across S cotland and E ngland. Cultivar resistance was clearly demonstrated to be an effective method of reducing black dot disease severity on tubers (described here as the percentage of unmarketable tubers, i.e. those with symptoms covering a surface area of >10%). In the four field trials carried out in 2004 and 2005, in irrigated and fungicide‐untreated plots, 43·8% of tubers of cv. M aris P iper were unmarketable, compared with 17·0% of tubers of cv. S ante. Assessments of disease development on underground plant parts (stems, stolons and roots) revealed that cultivar resistance acted only at the tuber level, as disease symptoms on other parts were often high irrespective of published disease resistance ratings. Irrigation increased the severity of disease on tubers in two trials ( E ngland 2004 and 2006), but its effect was less significant when rainfall was high. Delaying harvest by 2 weeks increased disease severity in all six trials, whilst application of azoxystrobin consistently reduced black dot severity. There were significant interactions between factors. The results clearly show how black dot disease severity can be reduced through an integrated approach to disease management.
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Claims 7
Claim · model-written summary
Cultivar resistance reduces black dot disease severity on potato tubers.
- Taxon
- potato
Solanum tuberosume1 - Treatment
- cultivar resistancee2
- Interactor
- C olletotrichum coccodese1pathogen
- Outcome
- black dot disease severity on tuberse2
- Direction
- reducinge2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“black dot development on potato tubers grown in fields where soilborne inoculum of C olletotrichum coccodes was present”
e2“Cultivar resistance was clearly demonstrated to be an effective method of reducing black dot disease severity on tubers”
Claim · model-written summary
Tubers of cv. Maris Piper were 43.8% unmarketable compared with 17.0% for cv. Sante in irrigated, fungicide-untreated plots.
- Taxon
- potatoSolanum tuberosume1
- Material
- M aris P ipere3
- Interactor
- C olletotrichum coccodese1pathogen
- Outcome
- unmarketablee3
- Value
- 43·8%e3
- Qualifier
- 17·0%e3
- Comparator
- S antee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“black dot development on potato tubers grown in fields where soilborne inoculum of C olletotrichum coccodes was present”
e3“43·8% of tubers of cv. M aris P iper were unmarketable, compared with 17·0% of tubers of cv. S ante”
Claim · model-written summary
Cultivar resistance acted only at the tuber level, not on stems, stolons and roots.
- Taxon
- potatoSolanum tuberosume1
- Organ / stage
- stems, stolons and rootse5
- Interactor
- C olletotrichum coccodese1pathogen
- Outcome
- disease symptoms on other partse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“black dot development on potato tubers grown in fields where soilborne inoculum of C olletotrichum coccodes was present”
e4“cultivar resistance acted only at the tuber level, as disease symptoms on other parts were often high irrespective of published disease resistance ratings”
e5“Assessments of disease development on underground plant parts (stems, stolons and roots)”
Claim · model-written summary
Irrigation increased black dot severity on tubers in two trials, with a smaller effect when rainfall was high.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- Irrigatione6
- Interactor
- C olletotrichum coccodese1pathogen
- Outcome
- severity of disease on tuberse6
- Direction
- increasede6
- Qualifier
- less significant when rainfall was highe7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“black dot development on potato tubers grown in fields where soilborne inoculum of C olletotrichum coccodes was present”
e6“Irrigation increased the severity of disease on tubers in two trials”
e7“its effect was less significant when rainfall was high”
Claim · model-written summary
Delaying harvest by 2 weeks increased black dot severity in all six trials.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- Delaying harvest by 2 weekse2
- Interactor
- C olletotrichum coccodese1pathogen
- Outcome
- disease severitye2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“black dot development on potato tubers grown in fields where soilborne inoculum of C olletotrichum coccodes was present”
e2“Delaying harvest by 2 weeks increased disease severity in all six trials”
Claim · model-written summary
Application of azoxystrobin consistently reduced black dot severity.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- application of azoxystrobine2
- Interactor
- C olletotrichum coccodese1pathogen
- Outcome
- black dot severitye2
- Direction
- reducede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“black dot development on potato tubers grown in fields where soilborne inoculum of C olletotrichum coccodes was present”
e2“application of azoxystrobin consistently reduced black dot severity”
Claim · model-written summary
Interactions between the tested factors were significant for black dot severity.
- Taxon
- potatoSolanum tuberosume1
- Interactor
- C olletotrichum coccodese1pathogen
- Outcome
- interactions between factorse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“black dot development on potato tubers grown in fields where soilborne inoculum of C olletotrichum coccodes was present”
e2“There were significant interactions between factors”
The same questions in other papers
azoxystrobin · disease · Solanum tuberosum (potato)Results agree
10 papers in the same direction as this paper
- positive
- positive
- positive
7 papers more in this group
See all 11 papers →irrigation · disease · Solanum tuberosum (potato)Positive and negative results
5 papers in the same direction as this paper · 16 in the opposite direction
- positive
- positive
- positive
18 papers more in this group
See all 22 papers →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.