Abstract
Population parameters of the green peach aphid (GPA), Myzus persicae (Sulzer), were compared on potatoes fertilized with different levels of nitrogen (N) (56, 84, 140, and 224 kg N/ha). Abundance of GPA was not significantly different among N treatments. The population growth rate of GPA increased with the level of N applied. However, the highest level of N (224 kg N/ha) reduced the rate of population growth. Populations grew more rapidly on potatoes fertilized with a split-applied intermediate N treatment (56 + 84 kg N/ha) than on potatoes fertilized with 56, 56 + 28, or 56 + 168 kg N/ha. Additionally, populations of GPA grew more rapidly when 224 kg N/ha was applied in one application than when applied in two applications. The rate of population growth was positively correlated with the concentration of free amino acids in leaves. The within-plant distribution of GPA was similar for all treatments. GPA were consistently more abundant on the lower leaves in each treatment. Population growth rates were greater on lower leaves than on other leaves in most N treatments. Population growth rates were negatively correlated with foliar concentrations of free amino acids within leaves of different vertical zones, but were positively correlated with foliar concentrations of nitrate N within leaves of different vertical zones. Also, population growth rates were positively correlated with the percentage of the total organic N pool composed of amino N within leaves of different vertical zones. Implications of variable host-plant nutritional quality in pest management are illustrated.
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Claims 12
Claim · model-written summary
Abundance of the green peach aphid was not significantly different among nitrogen treatments.
- Taxon
- potato
Solanum tuberosumt0 - Treatment
- N treatmentse1
- Interactor
- green peach aphid
Myzus persicaee0pest - Outcome
- Abundance of GPAe1
- Direction
- not significantly differente1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato Insects”
e0“Population parameters of the green peach aphid (GPA), Myzus persicae (Sulzer), were compared on potatoes fertilized with different levels of nitrogen (N)”
e1“Abundance of GPA was not significantly different among N treatments”
Claim · model-written summary
Aphid population growth rate increased with the level of nitrogen applied.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- level of N appliede2
- Interactor
- GPAe2pest
- Outcome
- population growth ratee2
- Direction
- increasede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato Insects”
e2“The population growth rate of GPA increased with the level of N applied”
Claim · model-written summary
The highest nitrogen level (224 kg N/ha) reduced the rate of population growth.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- highest level of N (224 kg N/ha)e3
- Outcome
- rate of population growthe3
- Direction
- reducede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato Insects”
e3“However, the highest level of N (224 kg N/ha) reduced the rate of population growth”
Claim · model-written summary
Populations grew more rapidly with the split-applied intermediate nitrogen treatment (56 + 84 kg N/ha) than with 56, 56 + 28, or 56 + 168 kg N/ha.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- split-applied intermediate N treatment (56 + 84 kg N/ha)e4
- Outcome
- Populations grewe4
- Direction
- more rapidlye4
- Comparator
- 56, 56 + 28, or 56 + 168 kg N/hae4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato Insects”
e4“Populations grew more rapidly on potatoes fertilized with a split-applied intermediate N treatment (56 + 84 kg N/ha) than on potatoes fertilized with 56, 56 + 28, or 56 + 168 kg N/ha”
Claim · model-written summary
Aphid populations grew more rapidly with 224 kg N/ha in one application than in two applications.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- 224 kg N/ha was applied in one applicatione5
- Interactor
- GPAe5pest
- Outcome
- populations of GPA grewe5
- Direction
- more rapidlye5
- Comparator
- two applicationse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato Insects”
e5“Additionally, populations of GPA grew more rapidly when 224 kg N/ha was applied in one application than when applied in two applications”
Claim · model-written summary
GPA were more abundant on the lower leaves in each treatment.
- Taxon
- potatoSolanum tuberosumt0
- Organ / stage
- lower leavese6
- Interactor
- GPAe6pest
- Outcome
- GPAe6
- Direction
- more abundante6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato Insects”
e6“GPA were consistently more abundant on the lower leaves in each treatment”
Claim · model-written summary
The within-plant distribution of the green peach aphid was similar for all treatments.
- Taxon
- potatoSolanum tuberosumt0
- Interactor
- GPAe7pest
- Outcome
- within-plant distribution of GPAe7
- Direction
- was similare7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato Insects”
e7“The within-plant distribution of GPA was similar for all treatments”
Claim · model-written summary
Population growth rates were greater on lower leaves than on other leaves in most nitrogen treatments.
- Taxon
- potatoSolanum tuberosumt0
- Organ / stage
- lower leavese1
- Outcome
- Population growth ratese1
- Direction
- greatere1
- Comparator
- other leavese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato Insects”
e1“Population growth rates were greater on lower leaves than on other leaves in most N treatments”
Claim · model-written summary
Population growth rates were negatively correlated with foliar free amino acids within leaves of different vertical zones.
- Taxon
- potatoSolanum tuberosumt0
- Compound
- free amino acidse2
- Outcome
- Population growth ratese2
- Direction
- negatively correlatede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato Insects”
e2“Population growth rates were negatively correlated with foliar concentrations of free amino acids within leaves of different vertical zones, but were positively correlated with foliar concentrations of nitrate N within leaves of different vertical zones”
Claim · model-written summary
Population growth rates were positively correlated with foliar nitrate N within leaves of different vertical zones.
- Taxon
- potatoSolanum tuberosumt0
- Compound
- nitrate Ne2
- Outcome
- Population growth ratese2
- Direction
- positively correlatede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato Insects”
e2“Population growth rates were negatively correlated with foliar concentrations of free amino acids within leaves of different vertical zones, but were positively correlated with foliar concentrations of nitrate N within leaves of different vertical zones”
Claim · model-written summary
Population growth rates were positively correlated with the percentage of the total organic N pool composed of amino N.
- Taxon
- potatoSolanum tuberosumt0
- Compound
- amino Ne3
- Outcome
- population growth ratese3
- Direction
- positively correlatede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato Insects”
e3“Also, population growth rates were positively correlated with the percentage of the total organic N pool composed of amino N within leaves of different vertical zones”
Claim · model-written summary
The rate of population growth was positively correlated with free amino acids in leaves.
- Taxon
- potatoSolanum tuberosumt0
- Compound
- free amino acidse4
- Outcome
- rate of population growthe4
- Direction
- positively correlatede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato Insects”
e4“The rate of population growth was positively correlated with the concentration of free amino acids in leaves”
The same questions in other papers
nitrogen · pest · Solanum tuberosum (potato)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
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.