Abstract
SUMMARY After 10 days of infestation by the aphid Myzus persicae growth of radish seedlings was reduced by 38 %, and the volume of sap bleeding from the stumps of cut stems of infested seedlings was 4% of that exuding from the stumps of uninfested seedlings of the same age. Diminished bleeding could not be accounted for by the 52 % reduction in the weight of the roots of infested seedlings. After 14 days of infestation, necrotic patches developed along the veins of the cotyledons which yellowed noticeably. If freed of aphids the seedlings subsequently resumed growth and their was an increase in the volume of bleeding sap produced by their cut stems. Symptoms associated with aphid infestation cannot be attributed either to virus disease or initially to exhaustion of the seedling's carbohydrate and nitrogen reserves. Possible causes of the symptoms described are discussed.
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Claims 8
Claim · model-written summary
Ten days of aphid infestation reduced radish seedling growth by 38 %.
- Taxon
- radish seedlings
Raphanus sativuse0 - Treatment
- infestation by the aphid Myzus persicaee0
- Interactor
- Myzus persicae
Myzus persicaee0pest - Outcome
- growth of radish seedlingse0
- Direction
- reducede0
- Value
- 38 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 10 days of infestation by the aphid Myzus persicae growth of radish seedlings was reduced by 38 %”
Claim · model-written summary
Sap bleeding from infested radish stems was 4% of that from uninfested seedlings.
- Taxon
- radish seedlingsRaphanus sativust0
- Treatment
- infested seedlingse0
- Interactor
- Myzus persicaeMyzus persicaet0pest
- Outcome
- volume of sap bleedinge0
- Direction
- lowerinferrede0
- Value
- 4%e0
- Comparator
- uninfested seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the volume of sap bleeding from the stumps of cut stems of infested seedlings was 4% of that exuding from the stumps of uninfested seedlings of the same age”
t0“radish seedlings, Raphanus sativus, infested with the aphid, Myzus persicae”
Claim · model-written summary
Infestation reduced radish root weight by 52 %.
- Taxon
- radish seedlingsRaphanus sativust0
- Treatment
- infested seedlingse0
- Interactor
- Myzus persicaeMyzus persicaet0pest
- Outcome
- weight of the rootse0
- Direction
- reductione0
- Value
- 52 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the 52 % reduction in the weight of the roots of infested seedlings”
t0“radish seedlings, Raphanus sativus, infested with the aphid, Myzus persicae”
Claim · model-written summary
Root weight reduction did not explain diminished sap bleeding.
- Taxon
- radish seedlingsRaphanus sativust0
- Organ / stage
- rootse0
- Outcome
- Diminished bleedinge0
- Qualifier
- could not be accounted for by the 52 % reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diminished bleeding could not be accounted for by the 52 % reduction in the weight of the roots of infested seedlings”
t0“radish seedlings, Raphanus sativus, infested with the aphid, Myzus persicae”
Claim · model-written summary
After 14 days of infestation, necrotic patches developed on cotyledon veins and the cotyledons yellowed.
- Taxon
- radish seedlingsRaphanus sativust0
- Organ / stage
- cotyledonse0
- Interactor
- Myzus persicaeMyzus persicaet0pest
- Outcome
- necrotic patches developed along the veins of the cotyledons which yellowed noticeablye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 14 days of infestation, necrotic patches developed along the veins of the cotyledons which yellowed noticeably”
t0“radish seedlings, Raphanus sativus, infested with the aphid, Myzus persicae”
Claim · model-written summary
Seedlings resumed growth after aphids were removed.
- Taxon
- radish seedlingsRaphanus sativust0
- Treatment
- freed of aphidse0
- Interactor
- aphidsAphidomorphae0pest
- Outcome
- resumed growthe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“If freed of aphids the seedlings subsequently resumed growth”
t0“radish seedlings, Raphanus sativus, infested with the aphid, Myzus persicae”
Claim · model-written summary
Sap bleeding increased after aphids were removed.
- Taxon
- radish seedlingsRaphanus sativust0
- Treatment
- freed of aphidse0
- Interactor
- aphidsAphidomorphae0pest
- Outcome
- volume of bleeding sape0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“If freed of aphids the seedlings subsequently resumed growth and their was an increase in the volume of bleeding sap produced by their cut stems”
t0“radish seedlings, Raphanus sativus, infested with the aphid, Myzus persicae”
Claim · model-written summary
The authors ruled out virus disease and initial carbohydrate or nitrogen exhaustion as causes of infestation symptoms.
- Taxon
- radish seedlingsRaphanus sativust0
- Interactor
- aphidt0pest
- Outcome
- Symptoms associated with aphid infestatione0
- Qualifier
- cannot be attributed either to virus disease or initially to exhaustion of the seedling's carbohydrate and nitrogen reservese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Symptoms associated with aphid infestation cannot be attributed either to virus disease or initially to exhaustion of the seedling's carbohydrate and nitrogen reserves”
t0“radish seedlings, Raphanus sativus, infested with the aphid, Myzus persicae”
The same questions in other papers
infection · growth · Raphanus sativus (radish)Results agree
2 papers in the same direction as this paper
- negative
- negative
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.