Abstract
Field experiments were conducted by caging groups of pea plants, Pisum sativum L., or pairs of flowers and pods and infesting them with various densities of pea aphid, Acyrthosiphon pisum (Harris). Plants infested up to time of flowering recovered from the damage and their yield was normal. Infestation of plants until flowers opened or longer reduced dry matter production, increased number of flowersand pods shed, reduced number of pods per plant and number of seeds per pod, increased percentage of empty pods, reduced weight of 1,000 seeds and yield of seeds, reduced weight of nitrogen-fixing root nodules, but did not affect protein content of seeds. All flower and pod stages were sensitive to direct feeding damage, but young pods were most susceptible. Feeding damage to flowers and pods was highly correlated with aphid density and young pods infested with four aphids for 4 days showed significant reductions in yield. We conclude that field peas must be protected from pea aphids for a 2- to 3-week period beginning when pods start to form.
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Claims 12
Claim · model-written summary
Plants infested only up to flowering recovered and yielded normally.
- Taxon
- pea plants
Lathyrus oleraceuse1 - Interactor
- pea aphid
-PLoS.jpg?width=60)
Acyrthosiphon pisume1pest - Outcome
- their yield was normale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
-PLoS.jpg?width=500)
Verbatim
e0“Plants infested up to time of flowering recovered from the damage and their yield was normal.”
e1“pea plants, Pisum sativum L., or pairs of flowers and pods and infesting them with various densities of pea aphid”
Claim · model-written summary
Infestation through flower opening or longer reduced dry matter production.
- Taxon
- pea plantsLathyrus oleraceuse1
- Treatment
- Infestation of plants until flowers opened or longere0
- Interactor
- pea aphidAcyrthosiphon pisume1pest
- Outcome
- dry matter productione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Infestation of plants until flowers opened or longer reduced dry matter production”
e1“pea plants, Pisum sativum L., or pairs of flowers and pods and infesting them with various densities of pea aphid”
Claim · model-written summary
Infestation increased flower and pod shedding.
- Taxon
- pea plantsLathyrus oleraceuse1
- Treatment
- Infestation of plants until flowers opened or longere2
- Interactor
- pea aphidAcyrthosiphon pisume1pest
- Outcome
- number of flowersand pods shede0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased number of flowersand pods shed”
e1“pea plants, Pisum sativum L., or pairs of flowers and pods and infesting them with various densities of pea aphid”
e2“Infestation of plants until flowers opened or longer”
Claim · model-written summary
Infestation reduced pods per plant and seeds per pod.
- Taxon
- pea plantsLathyrus oleraceuse1
- Treatment
- Infestation of plants until flowers opened or longere2
- Interactor
- pea aphidAcyrthosiphon pisume1pest
- Outcome
- number of pods per plant and number of seeds per pode0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced number of pods per plant and number of seeds per pod”
e1“pea plants, Pisum sativum L., or pairs of flowers and pods and infesting them with various densities of pea aphid”
e2“Infestation of plants until flowers opened or longer”
Claim · model-written summary
Infestation increased the percentage of empty pods.
- Taxon
- pea plantsLathyrus oleraceuse1
- Treatment
- Infestation of plants until flowers opened or longere2
- Interactor
- pea aphidAcyrthosiphon pisume1pest
- Outcome
- percentage of empty podse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased percentage of empty pods”
e1“pea plants, Pisum sativum L., or pairs of flowers and pods and infesting them with various densities of pea aphid”
e2“Infestation of plants until flowers opened or longer”
Claim · model-written summary
Infestation reduced 1,000-seed weight and seed yield.
- Taxon
- pea plantsLathyrus oleraceuse1
- Treatment
- Infestation of plants until flowers opened or longere2
- Interactor
- pea aphidAcyrthosiphon pisume1pest
- Outcome
- weight of 1,000 seeds and yield of seedse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced weight of 1,000 seeds and yield of seeds”
e1“pea plants, Pisum sativum L., or pairs of flowers and pods and infesting them with various densities of pea aphid”
e2“Infestation of plants until flowers opened or longer”
Claim · model-written summary
Infestation reduced nitrogen-fixing root nodule weight.
- Taxon
- pea plantsLathyrus oleraceuse1
- Treatment
- Infestation of plants until flowers opened or longere2
- Interactor
- pea aphidAcyrthosiphon pisume1pest
- Outcome
- weight of nitrogen-fixing root nodulese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced weight of nitrogen-fixing root nodules”
e1“pea plants, Pisum sativum L., or pairs of flowers and pods and infesting them with various densities of pea aphid”
e2“Infestation of plants until flowers opened or longer”
Claim · model-written summary
Infestation did not affect seed protein content.
- Taxon
- pea plantsLathyrus oleraceuse1
- Treatment
- Infestation of plants until flowers opened or longere2
- Interactor
- pea aphidAcyrthosiphon pisume1pest
- Outcome
- protein content of seedse0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but did not affect protein content of seeds.”
e1“pea plants, Pisum sativum L., or pairs of flowers and pods and infesting them with various densities of pea aphid”
e2“Infestation of plants until flowers opened or longer”
Claim · model-written summary
All flower and pod stages were sensitive to feeding damage, with young pods most susceptible.
- Taxon
- pea plantsLathyrus oleraceuse1
- Organ / stage
- young podse0
- Interactor
- pea aphidAcyrthosiphon pisume1pest
- Outcome
- young pods were most susceptiblee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All flower and pod stages were sensitive to direct feeding damage, but young pods were most susceptible.”
e1“pea plants, Pisum sativum L., or pairs of flowers and pods and infesting them with various densities of pea aphid”
Claim · model-written summary
Feeding damage to flowers and pods was highly correlated with aphid density.
- Taxon
- pea plantsLathyrus oleraceuse1
- Interactor
- pea aphidAcyrthosiphon pisume1pest
- Outcome
- Feeding damage to flowers and podse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Feeding damage to flowers and pods was highly correlated with aphid density”
e1“pea plants, Pisum sativum L., or pairs of flowers and pods and infesting them with various densities of pea aphid”
Claim · model-written summary
Four aphids on young pods for four days significantly reduced yield.
- Taxon
- pea plantsLathyrus oleraceuse1
- Organ / stage
- young podse0
- Treatment
- four aphids for 4 dayse0
- Interactor
- pea aphidAcyrthosiphon pisume1pest
- Outcome
- yielde0
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“young pods infested with four aphids for 4 days showed significant reductions in yield.”
e1“pea plants, Pisum sativum L., or pairs of flowers and pods and infesting them with various densities of pea aphid”
Claim · model-written summary
The authors recommend protecting field peas from aphids for two to three weeks from pod formation.
- Taxon
- field pease0
- Interactor
- pea aphidsAcyrthosiphon pisume0pest
- Outcome
- must be protected from pea aphids for a 2- to 3-week period beginning when pods start to forme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“field peas must be protected from pea aphids for a 2- to 3-week period beginning when pods start to form.”
The same questions in other papers
infection · Acyrthosiphon pisum · Lathyrus oleraceus (pea)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
1 paper more in this group
See all 5 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.