Abstract
Abstract Populations of pea aphid, Acyrthosiphon pisum (Harris), were sampled through the summer of 1984 on five cultivars and in 1985 and 1986 on six cultivars of field peas, Pisum sativum L., grown in field plots in southern Manitoba. Patterns of pea aphid population growth were generally similar among cultivars in any one year. Aphid populations on all cultivars in all years remained relatively low until mid-July, then increased rapidly, peaked at about the beginning of August, and declined sharply to low levels in late August. At the time of peak aphid numbers, significant differences in aphid population densities were found among cultivars in 2 years; the lowest densities were found on the cultivars Century and Tipu, and the highest densities on Triumph or Trapper. Pea aphid feeding was not detrimental to any yield parameters except 1000 seed weight. In 1984 Triumph and Tara, and in 1985 Triumph had significantly decreased 1000 seed weights in plots in which aphid densities were not controlled. Differences in the abundance of the aphid among cultivars were not reflected in their yield responses. Over 3 years the regression line of aphid densities upon Century seed weight was significantly steeper than those of Trapper, Lenca, or Tara. Trapper was least affected by aphid feeding. Results indicated that the economic threshold of pea aphids on peas other than Century needs to be re-evaluated.
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Claims 10
Claim · model-written summary
Aphid populations on field peas in southern Manitoba remained low until mid-July, then increased rapidly, peaked at about the beginning of August and declined sharply by late August.
- Taxon
- field pease1
- Interactor
- pea aphid
-PLoS.jpg?width=60)
Acyrthosiphon pisume0pest - Outcome
- Aphid populationse2
- Setting
- field plots in southern Manitobae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
-PLoS.jpg?width=500)
Verbatim
e0“Populations of pea aphid, Acyrthosiphon pisum (Harris)”
e1“field peas, Pisum sativum L., grown in field plots in southern Manitoba”
e2“Aphid populations on all cultivars in all years remained relatively low until mid-July, then increased rapidly, peaked at about the beginning of August, and declined sharply to low levels in late August”
Claim · model-written summary
Pea aphid population growth patterns were generally similar among field pea cultivars within a year.
- Taxon
- field pease1
- Interactor
- pea aphidAcyrthosiphon pisume0pest
- Outcome
- Patterns of pea aphid population growthe2
- Direction
- generally similare2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Populations of pea aphid, Acyrthosiphon pisum (Harris)”
e1“field peas, Pisum sativum L., grown in field plots in southern Manitoba”
e2“Patterns of pea aphid population growth were generally similar among cultivars in any one year”
Claim · model-written summary
At peak aphid numbers, aphid population densities were lowest on the cultivars Century and Tipu (significant differences among cultivars in 2 years).
- Taxon
- field pease1
- Material
- Century and Tipue3
- Interactor
- pea aphidAcyrthosiphon pisume0pest
- Outcome
- aphid population densitiese2
- Direction
- lowest densitiese3
- Qualifier
- in 2 yearse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Populations of pea aphid, Acyrthosiphon pisum (Harris)”
e1“field peas, Pisum sativum L., grown in field plots in southern Manitoba”
e2“At the time of peak aphid numbers, significant differences in aphid population densities were found among cultivars in 2 years”
e3“the lowest densities were found on the cultivars Century and Tipu”
Claim · model-written summary
At peak aphid numbers, aphid population densities were highest on the cultivars Triumph or Trapper (significant differences among cultivars in 2 years).
- Taxon
- field pease1
- Material
- Triumph or Trappere4
- Interactor
- pea aphidAcyrthosiphon pisume0pest
- Outcome
- aphid population densitiese2
- Direction
- highest densitiese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Populations of pea aphid, Acyrthosiphon pisum (Harris)”
e1“field peas, Pisum sativum L., grown in field plots in southern Manitoba”
e2“At the time of peak aphid numbers, significant differences in aphid population densities were found among cultivars in 2 years”
e4“the highest densities on Triumph or Trapper”
Claim · model-written summary
Pea aphid feeding did not reduce yield parameters of field peas, except 1000 seed weight.
- Taxon
- field pease1
- Treatment
- Pea aphid feedinge5
- Interactor
- pea aphidAcyrthosiphon pisume0pest
- Outcome
- yield parameterse5
- Direction
- not detrimentale5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Populations of pea aphid, Acyrthosiphon pisum (Harris)”
e1“field peas, Pisum sativum L., grown in field plots in southern Manitoba”
e5“Pea aphid feeding was not detrimental to any yield parameters except 1000 seed weight”
Claim · model-written summary
Aphid feeding in plots where aphid densities were not controlled significantly decreased 1000 seed weight in Triumph and Tara (1984) and Triumph (1985).
- Taxon
- field pease1
- Material
- Triumph and Tarae6
- Treatment
- aphid densities were not controllede6
- Interactor
- pea aphidAcyrthosiphon pisume0pest
- Outcome
- 1000 seed weightse6
- Direction
- decreasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Populations of pea aphid, Acyrthosiphon pisum (Harris)”
e1“field peas, Pisum sativum L., grown in field plots in southern Manitoba”
e6“In 1984 Triumph and Tara, and in 1985 Triumph had significantly decreased 1000 seed weights in plots in which aphid densities were not controlled”
Claim · model-written summary
Differences in pea aphid abundance among cultivars were not reflected in their yield responses.
- Taxon
- field pease1
- Interactor
- pea aphidAcyrthosiphon pisume0pest
- Outcome
- yield responsese7
- Direction
- not reflectede7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Populations of pea aphid, Acyrthosiphon pisum (Harris)”
e1“field peas, Pisum sativum L., grown in field plots in southern Manitoba”
e7“Differences in the abundance of the aphid among cultivars were not reflected in their yield responses”
Claim · model-written summary
Over three years, the regression slope of aphid densities on Century seed weight was significantly steeper than those for Trapper, Lenca and Tara.
- Taxon
- field pease1
- Material
- Centurye2
- Interactor
- pea aphidAcyrthosiphon pisume0pest
- Outcome
- regression line of aphid densities upon Century seed weighte2
- Direction
- steepere2
- Qualifier
- Over 3 yearse2
- Comparator
- Trapper, Lenca, or Tarae2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Populations of pea aphid, Acyrthosiphon pisum (Harris)”
e1“field peas, Pisum sativum L., grown in field plots in southern Manitoba”
e2“Over 3 years the regression line of aphid densities upon Century seed weight was significantly steeper than those of Trapper, Lenca, or Tara”
Claim · model-written summary
Trapper was least affected by pea aphid feeding among the field pea cultivars.
- Taxon
- field pease1
- Material
- Trappere2
- Treatment
- aphid feedinge2
- Interactor
- pea aphidAcyrthosiphon pisume0pest
- Outcome
- least affectede2
- Direction
- least affectede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Populations of pea aphid, Acyrthosiphon pisum (Harris)”
e1“field peas, Pisum sativum L., grown in field plots in southern Manitoba”
e2“Trapper was least affected by aphid feeding”
Claim · model-written summary
The economic threshold of pea aphids on peas other than Century needs to be re-evaluated.
- Taxon
- peas
Lathyrus oleraceuse2 - Interactor
- pea aphidAcyrthosiphon pisume0pest
- Outcome
- economic threshold of pea aphidse2
- Qualifier
- other than Centurye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Populations of pea aphid, Acyrthosiphon pisum (Harris)”
e2“the economic threshold of pea aphids on peas other than Century needs to be re-evaluated”
The same questions in other papers
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- negative
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4 in the opposite direction
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See all 5 papers →infection · yield · Lathyrus oleraceus (pea)Results agree
8 papers in the same direction as this paper
- negative
- negative
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See all 9 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.