Abstract
Foliar sprays of potato plants with phosphonic acid (partially neutralised with potassium hydroxide to pH 6.4) substantially reduced infection of the tubers by Phytophthora infestans, the cause of late blight, in glasshouse and field experiments over a 4-year period. Healthy tubers of blight-susceptible cultivars removed from treated plants and artificially inoculated by spraying with sporangial/zoospore suspensions of P infestans did not develop disease symptoms, demonstrating that the phosphonate applications had directly reduced the susceptibility of tubers to infection, probably as a result of translocation into tuber tissue. In contrast, foliar application of fosetyl-aluminium did not significantly reduce tuber blight development following inoculation. Five to six sprays of partially neutralised phosphonic acid (2 kg ha-1) applied at 10-14 day intervals resulted in the least tuber infection, but such a treatment regime may not be economic. In trials where the effect of timing and rate of application of 2-4 kg phosphonic acid ha-1 was examined, a single treatment of 4 kg ha-1 applied mid- or late-season proved the most effective. A spray programme in which one or two applications of phosphonic acid are combined with use of a non-systemic or systemic fungicide to enhance foliar protection offers the possibility of controlling both foliage and tuber blight and could have a major impact in reducing overwinter survival of P infestans in tubers.
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Claims 7
Claim · model-written summary
Foliar phosphonic acid substantially reduced potato tuber infection by Phytophthora infestans.
- Taxon
- potato
Solanum tuberosume0 - Treatment
- Foliar sprays of potato plants with phosphonic acide0
- Interactor
- Phytophthora infestans
Phytophthora infestanse0pathogen - Outcome
- infection of the tubers by Phytophthora infestanse0
- Direction
- reducede0
- Setting
- glasshouse and fielde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar sprays of potato plants with phosphonic acid (partially neutralised with potassium hydroxide to pH 6.4) substantially reduced infection of the tubers by Phytophthora infestans, the cause of late blight, in glasshouse and field experiments over a 4-year period.”
Claim · model-written summary
Inoculated tubers from treated plants developed no disease symptoms.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- treated plantse0
- Interactor
- P infestansPhytophthora infestanse0pathogen
- Outcome
- did not develop disease symptomse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Healthy tubers of blight-susceptible cultivars removed from treated plants and artificially inoculated by spraying with sporangial/zoospore suspensions of P infestans did not develop disease symptoms”
t0“potato tubers”
Claim · model-written summary
The authors attributed lower tuber susceptibility probably to translocation into tuber tissue.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- phosphonate applicationse0
- Outcome
- susceptibility of tubers to infectione0
- Direction
- reducede0
- Qualifier
- probably as a result of translocation into tuber tissuee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phosphonate applications had directly reduced the susceptibility of tubers to infection, probably as a result of translocation into tuber tissue.”
t0“potato tubers”
Claim · model-written summary
Foliar fosetyl aluminium did not significantly reduce inoculated tuber blight.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- foliar application of fosetyl-aluminiume0
- Interactor
- P infestansPhytophthora infestanse2pathogen
- Outcome
- tuber blight developmente0
- Direction
- did not significantly reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar application of fosetyl-aluminium did not significantly reduce tuber blight development following inoculation.”
t0“potato tubers”
e2“Healthy tubers of blight-susceptible cultivars removed from treated plants and artificially inoculated by spraying with sporangial/zoospore suspensions of P infestans did not develop disease symptoms”
Claim · model-written summary
Five to six phosphonic acid sprays at 2 kg per hectare gave the least tuber infection.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Five to six sprays of partially neutralised phosphonic acid (2 kg ha-1) applied at 10-14 day intervalse0
- Outcome
- tuber infectione0
- Direction
- leaste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Five to six sprays of partially neutralised phosphonic acid (2 kg ha-1) applied at 10-14 day intervals resulted in the least tuber infection”
t0“potato tubers”
Claim · model-written summary
A single 4 kg per hectare treatment in mid or late season was most effective.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- a single treatment of 4 kg ha-1 applied mid- or late-seasone0
- Outcome
- most effectivee0
- Direction
- most effectivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a single treatment of 4 kg ha-1 applied mid- or late-season proved the most effective.”
t0“potato tubers”
Claim · model-written summary
Authors proposed combining phosphonic acid with a fungicide to control foliage and tuber blight.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- one or two applications of phosphonic acid are combined with use of a non-systemic or systemic fungicidee0
- Outcome
- controlling both foliage and tuber blighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A spray programme in which one or two applications of phosphonic acid are combined with use of a non-systemic or systemic fungicide to enhance foliar protection offers the possibility of controlling both foliage and tuber blight”
t0“potato tubers”
The same questions in other papers
fosetyl-Al · Phytophthora infestans · Solanum tuberosum (potato)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
application · Phytophthora infestans · Solanum tuberosum (potato)Positive and negative results
31 papers in the same direction as this paper · 3 in the opposite direction
- negative
- no effect
- no effect
31 papers more in this group
See all 35 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.