Abstract
The joint action of a plant parasitic nematode, Pratylenchus penetrans (root-lesion nematode), and an insect defoliator, Leptinotarsa decemlineata (Colorado potato beetle), on growth, development, and yield of Solanum tuberosum cv. Superior was studied in the field. Three population densities of P. penetrans were superimposed on each of three population levels of L. decemlineata. The major impact of P. penetrans on final yield was through a reduction in the number of tubers formed during tuber initiation. Defoliation by L. decemlineata increased with time as larvae advanced through successive instars and densities increased. This resulted in a significant reduction in tuber weight and numbers. Total yield of S. tuberosum was decreased by 66% with increasing population densities of L. decemlineata and 27 % with increasing densities of P. penetrans. L. decemlineata feeding did not affect soil population densities of P. penetrans. Root population densities of P. penetrans, however, were significantly (P = 0.05) higher in plants maintained beetle free than in plants grown in the presence of the beetles.
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Claims 7
Claim · model-written summary
Pratylenchus penetrans reduced the number of tubers formed during tuber initiation.
- Taxon
- Solanum tuberosum
Solanum tuberosumt0 - Organ / stage
- tuber initiatione0
- Treatment
- P. penetranse0
- Interactor
- P. penetrans
Pratylenchus penetranse0pest - Outcome
- number of tubers formede0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The major impact of P. penetrans on final yield was through a reduction in the number of tubers formed during tuber initiation.”
t0“Joint Influence of Pratylenchus penetrans (Nematoda) and Leptinotarsa decemlineata (Insecta) on Solanum tuberosum Productivity and Pest Population Dynamics.”
Claim · model-written summary
Beetle defoliation increased as larvae developed and densities rose.
- Taxon
- Solanum tuberosumSolanum tuberosumt0
- Interactor
- L. decemlineata
Leptinotarsa decemlineatae0pest - Outcome
- Defoliation by L. decemlineatae0
- Direction
- increasede0
- Qualifier
- larvae advanced through successive instars and densities increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Defoliation by L. decemlineata increased with time as larvae advanced through successive instars and densities increased.”
t0“Joint Influence of Pratylenchus penetrans (Nematoda) and Leptinotarsa decemlineata (Insecta) on Solanum tuberosum Productivity and Pest Population Dynamics.”
Claim · model-written summary
Beetle defoliation significantly reduced tuber weight and numbers.
- Taxon
- Solanum tuberosumSolanum tuberosumt0
- Treatment
- Defoliation by L. decemlineatae1
- Interactor
- L. decemlineataLeptinotarsa decemlineatae1pest
- Outcome
- tuber weight and numberse0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This resulted in a significant reduction in tuber weight and numbers.”
t0“Joint Influence of Pratylenchus penetrans (Nematoda) and Leptinotarsa decemlineata (Insecta) on Solanum tuberosum Productivity and Pest Population Dynamics.”
e1“Defoliation by L. decemlineata increased with time as larvae advanced through successive instars and densities increased.”
Claim · model-written summary
Increasing beetle densities decreased potato total yield by 66%.
- Taxon
- S. tuberosumSolanum tuberosume0
- Treatment
- increasing population densities of L. decemlineatae0
- Interactor
- L. decemlineataLeptinotarsa decemlineatae0pest
- Outcome
- Total yielde0
- Direction
- decreasede0
- Value
- 66%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total yield of S. tuberosum was decreased by 66% with increasing population densities of L. decemlineata and 27 % with increasing densities of P. penetrans.”
Claim · model-written summary
Increasing nematode densities decreased potato total yield by 27 %.
- Taxon
- S. tuberosumSolanum tuberosume0
- Treatment
- increasing densities of P. penetranse0
- Interactor
- P. penetransPratylenchus penetranse0pest
- Outcome
- Total yielde0
- Direction
- decreasede0
- Value
- 27 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total yield of S. tuberosum was decreased by 66% with increasing population densities of L. decemlineata and 27 % with increasing densities of P. penetrans.”
Claim · model-written summary
Beetle feeding did not affect soil nematode population density.
- Taxon
- Solanum tuberosumSolanum tuberosumt0
- Treatment
- L. decemlineata feedinge0
- Interactor
- P. penetransPratylenchus penetranse0pest
- Second interactor
- L. decemlineataLeptinotarsa decemlineatae0pest
- Outcome
- soil population densities of P. penetranse0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L. decemlineata feeding did not affect soil population densities of P. penetrans.”
t0“Joint Influence of Pratylenchus penetrans (Nematoda) and Leptinotarsa decemlineata (Insecta) on Solanum tuberosum Productivity and Pest Population Dynamics.”
Claim · model-written summary
Root nematode densities were significantly higher in beetle-free plants than beetle-exposed plants.
- Taxon
- Solanum tuberosumSolanum tuberosumt0
- Treatment
- plants maintained beetle freee0
- Interactor
- P. penetransPratylenchus penetranse0pest
- Second interactor
- Leptinotarsa decemlineataLeptinotarsa decemlineatat1pest
- Outcome
- Root population densities of P. penetranse0
- Direction
- highere0
- Value
- P = 0.05e0
- Comparator
- plants grown in the presence of the beetlese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root population densities of P. penetrans, however, were significantly (P = 0.05) higher in plants maintained beetle free than in plants grown in the presence of the beetles.”
t0“Joint Influence of Pratylenchus penetrans (Nematoda) and Leptinotarsa decemlineata (Insecta) on Solanum tuberosum Productivity and Pest Population Dynamics.”
t1“Leptinotarsa decemlineata”
The same questions in other papers
Pratylenchus penetrans · yield · Solanum tuberosum (potato)Results differ
4 papers in the same direction as this paper
- negative
- no effect
- negative
1 paper more in this group
See all 5 papers →Leptinotarsa decemlineata · yield · Solanum tuberosum (potato)Positive and negative results
1 in the opposite direction
- positive
pruning · yield · Solanum tuberosum (potato)Results differ
7 papers in the same direction as this paper · 8 in the opposite direction
- positive
- positive
- positive
12 papers more in this group
See all 16 papers →infection · Pratylenchus penetrans · Solanum tuberosum (potato)Results agree
2 papers in the same direction as this paper
- no effect
- 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.