Abstract
SUMMARY Glasshouse tests on potato cv. Arran Banner measured the effects of single early foliar sprays of 18 substituted benzoic and two dichloropicolinic acids on the severity of common scab, caused by soil‐borne Streptomyces scabies. The monosubstituted benzoic acids tested (25 mM) did not affect scab. However, anti‐scab action was shown by some 2,5‐disubstituted acids. Decreases in scab severity were about 35% from 1·6 mM 5‐bromo‐2‐chloro‐ and 2,5‐dimethylbenzoic acids, and over 50% from 1·6 mM 2,5‐dichloro‐, 2,5‐dibromo‐ and 5‐chloro‐2‐nitrobenzoic acids and from 0·05 mM 3,6‐dichloropicolinic acid (clopyralid), which is structurally similar to 2,5‐dichlorobenzoic acid. None of the spray treatments affected yield or shape of tubers. No visible effects on foliage were caused by two of the benzoic acids active against scab (5‐chloro‐2‐nitro‐ and 2,5‐dimethyl‐), but the other active acids caused some distortion. In tests of the six dichlorobenzoic acids against S. scabies in culture, the 2,5‐isomer (which was the most effective against the disease in plants) was one of the least toxic. With other 2,5‐disubstituted benzoic acids, it probably decreased scab indirectly by altering the response of the host to infection.
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Claims 9
Claim · model-written summary
Monosubstituted benzoic acids at 25 mM did not affect potato scab.
- Taxon
- potato
Solanum tuberosumt0 - Treatment
- monosubstituted benzoic acids tested (25 mM)e0
- Outcome
- scabe0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The monosubstituted benzoic acids tested (25 mM) did not affect scab.”
t0“potato common scab”
Claim · model-written summary
Two 2,5-disubstituted acids reduced potato scab severity by about 35%.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- 1·6 mM 5‐bromo‐2‐chloro‐ and 2,5‐dimethylbenzoic acidse0
- Outcome
- scab severitye0
- Direction
- Decreasese0
- Value
- 35%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreases in scab severity were about 35% from 1·6 mM 5‐bromo‐2‐chloro‐ and 2,5‐dimethylbenzoic acids”
t0“potato common scab”
Claim · model-written summary
Three 2,5-disubstituted benzoic acids reduced potato scab severity by over 50%.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- 1·6 mM 2,5‐dichloro‐, 2,5‐dibromo‐ and 5‐chloro‐2‐nitrobenzoic acidse0
- Outcome
- scab severitye1
- Direction
- Decreasese1
- Value
- over 50%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“over 50% from 1·6 mM 2,5‐dichloro‐, 2,5‐dibromo‐ and 5‐chloro‐2‐nitrobenzoic acids”
e1“Decreases in scab severity were about 35%”
t0“potato common scab”
Claim · model-written summary
Clopyralid reduced potato scab severity by over 50%.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- 0·05 mM 3,6‐dichloropicolinic acid (clopyralid)e0
- Outcome
- scab severitye1
- Direction
- Decreasese1
- Value
- over 50%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“over 50% from 1·6 mM 2,5‐dichloro‐, 2,5‐dibromo‐ and 5‐chloro‐2‐nitrobenzoic acids and from 0·05 mM 3,6‐dichloropicolinic acid (clopyralid)”
e1“Decreases in scab severity were about 35%”
t0“potato common scab”
Claim · model-written summary
None of the potato spray treatments affected tuber yield or shape.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- spray treatmentse0
- Outcome
- yield or shape of tuberse0
- Direction
- None of the spray treatments affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“None of the spray treatments affected yield or shape of tubers.”
t0“potato common scab”
Claim · model-written summary
Two scab-active benzoic acids caused no visible foliage effects.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- 5‐chloro‐2‐nitro‐ and 2,5‐dimethyl‐e0
- Outcome
- visible effects on foliagee0
- Direction
- No visible effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No visible effects on foliage were caused by two of the benzoic acids active against scab (5‐chloro‐2‐nitro‐ and 2,5‐dimethyl‐)”
t0“potato common scab”
Claim · model-written summary
Other scab-active acids distorted potato foliage.
- Taxon
- potatoSolanum tuberosumt0
- Organ / stage
- foliagee1
- Treatment
- other active acidse0
- Outcome
- distortione0
- Direction
- causede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but the other active acids caused some distortion.”
e1“No visible effects on foliage were caused by two of the benzoic acids active against scab”
t0“potato common scab”
Claim · model-written summary
The scab-effective 2,5-dichlorobenzoic acid isomer was among the least toxic to S. scabies in culture.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- 2,5‐isomere0
- Interactor
- S. scabiesStreptomyces scabieie0pathogen
- Outcome
- toxice0
- Direction
- leaste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In tests of the six dichlorobenzoic acids against S. scabies in culture, the 2,5‐isomer (which was the most effective against the disease in plants) was one of the least toxic.”
t0“potato common scab”
Claim · model-written summary
The authors propose that 2,5-disubstituted acids reduce scab by altering host response to infection.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- 2,5‐disubstituted benzoic acidse0
- Outcome
- decreased scabe0
- Qualifier
- probablye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With other 2,5‐disubstituted benzoic acids, it probably decreased scab indirectly by altering the response of the host to infection.”
t0“potato common scab”
The same questions in other papers
application · yield · Solanum tuberosum (potato)Positive and negative results
13 papers in the same direction as this paper · 177 in the opposite direction
- positive
- positive
- positive
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See all 191 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.