Abstract
SUMMARY Single foliar sprays of the growth retardant daminozide (1.5–12 g/l) approximately halved the incidence of common scab, caused by soil‐borne Streptomyces scabies , on potted potato plants in the glasshouse. Two analogues of daminozide ( N‐ dimethylaminomaleamic and N ‐(dimethylamino)‐methylsuccinamic acids) also decreased scab, but others were inactive. Of 22 other unrelated growth regulators and translocated chemicals tested as foliar sprays, only gibberellic acid (0.1 g/l) decreased scab incidence, but many of the tubers were distorted. Chlormequat chloride and chlorphonium chloride, as root treatments, were inactive. In other experiments with daminozide, scab incidence was decreased after application to soil. In tests with two plants per pot, spraying one of each pair decreased its rate of stem extension, but did not affect the other, indicating that little or no daminozide passed into the soil from the roots of the sprayed plant. The decrease in scab brought about by foliar sprays was not altered by varying their timing during the period before symptom development (1 to 5 wk after potting). In agar plate tests, daminozide was only weakly toxic to S. scabies. It is concluded that daminozide probably decreased scab by altering the physiology of the plants, so that scab symptoms did not develop.
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Claims 15
Claim · model-written summary
Foliar daminozide approximately halved common scab incidence on potted potato plants.
- Taxon
- potato plants
Solanum tuberosume0 - Treatment
- foliar sprays of the growth retardant daminozide (1.5–12 g/l)e0
- Interactor
- Streptomyces scabiesStreptomyces scabieie0pathogen
- Outcome
- incidence of common scabe0
- Direction
- halvede0
- Setting
- glasshousee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Single foliar sprays of the growth retardant daminozide (1.5–12 g/l) approximately halved the incidence of common scab, caused by soil‐borne Streptomyces scabies , on potted potato plants in the glasshouse”
Claim · model-written summary
N‐ dimethylaminomaleamic acid decreased potato scab.
Not reportedTaxonComparator
Verbatim
e0“Two analogues of daminozide ( N‐ dimethylaminomaleamic and N ‐(dimethylamino)‐methylsuccinamic acids) also decreased scab, but others were inactive”
Claim · model-written summary
N ‐(dimethylamino)‐methylsuccinamic acid decreased potato scab.
Not reportedTaxonComparator
Verbatim
e0“Two analogues of daminozide ( N‐ dimethylaminomaleamic and N ‐(dimethylamino)‐methylsuccinamic acids) also decreased scab, but others were inactive”
Claim · model-written summary
Other daminozide analogues were inactive against scab.
Not reportedTaxonComparator
Verbatim
e0“Two analogues of daminozide ( N‐ dimethylaminomaleamic and N ‐(dimethylamino)‐methylsuccinamic acids) also decreased scab, but others were inactive”
Claim · model-written summary
Gibberellic acid at 0.1 g/l decreased scab incidence.
Not reportedTaxonComparator
Verbatim
e0“only gibberellic acid (0.1 g/l) decreased scab incidence, but many of the tubers were distorted”
Claim · model-written summary
Gibberellic acid treatment distorted many tubers.
Not reportedTaxonComparatorDirection
Verbatim
e0“only gibberellic acid (0.1 g/l) decreased scab incidence, but many of the tubers were distorted”
Claim · model-written summary
The other unrelated foliar growth regulators and translocated chemicals did not decrease scab.
Not reportedTaxonComparatorDirection
Verbatim
e0“Of 22 other unrelated growth regulators and translocated chemicals tested as foliar sprays, only gibberellic acid (0.1 g/l) decreased scab incidence”
Claim · model-written summary
Root applied chlormequat chloride was inactive against scab.
Not reportedTaxonComparator
Verbatim
e0“Chlormequat chloride and chlorphonium chloride, as root treatments, were inactive”
Claim · model-written summary
Root applied chlorphonium chloride was inactive against scab.
Not reportedTaxonComparator
Verbatim
e0“Chlormequat chloride and chlorphonium chloride, as root treatments, were inactive”
Claim · model-written summary
Soil application of daminozide decreased scab incidence.
Not reportedTaxonComparator
Verbatim
e0“In other experiments with daminozide, scab incidence was decreased after application to soil”
Claim · model-written summary
Spraying one plant of a paired pot reduced its stem extension rate.
Not reportedTaxonComparator
Verbatim
e0“spraying one of each pair decreased its rate of stem extension, but did not affect the other”
Claim · model-written summary
Spraying one plant of a paired pot did not affect the other plant.
Not reportedTaxonComparator
Verbatim
e0“spraying one of each pair decreased its rate of stem extension, but did not affect the other”
Claim · model-written summary
The reduction in scab after foliar sprays did not vary with timing 1 to 5 weeks after potting.
- Treatment
- varying their timinge0
- Outcome
- decrease in scabe0
- Direction
- not alterede0
- Qualifier
- 1 to 5 wk after pottinge0
Not reportedTaxonComparator
Verbatim
e0“The decrease in scab brought about by foliar sprays was not altered by varying their timing during the period before symptom development (1 to 5 wk after potting)”
Claim · model-written summary
Daminozide was only weakly toxic to S. scabies in agar tests.
- Interactor
- S. scabiesStreptomyces scabieie0pathogen
- Outcome
- weakly toxic to S. scabiese0
Not reportedTaxon
Verbatim
e0“In agar plate tests, daminozide was only weakly toxic to S. scabies”
Claim · model-written summary
Authors inferred daminozide probably decreased scab by altering plant physiology and preventing symptoms.
- Taxon
- plantsViridiplantaee0
- Treatment
- daminozidee0
- Outcome
- scab symptoms did not develope0
- Qualifier
- altering the physiology of the plantse0
Verbatim
e0“daminozide probably decreased scab by altering the physiology of the plants, so that scab symptoms did not develop”
The same questions in other papers
application · Streptomyces scabiei · Solanum tuberosum (potato)Results agree
2 papers in the same direction as this paper
- positive
- 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.