Abstract
The effects of test-location, daylength, thrips density, and choice or no-choice test on feeding damage by Frankliniella occidentalis (Pergande) were studied in chrysanthemum, Dendranthema grandiflora Tzvelev. Under all circumstances, tested cultivars differed significantly in the level of both silver and growth damage caused by thrips feeding on old and young chrysanthemum leaves, respectively. Thrips resistance to both types of feeding damage, measured under the different test circumstances was highly correlated. This means that thrips resistance in chrysanthemum measured in our standardized laboratory experiment gives a good prediction for chrysanthemum breeders who want to select cultivars for thrips resistance under commercial greenhouse conditions. Only test location had an effect on the level of growth damage. In the greenhouse, all chrysanthemum cultivars were more susceptible to growth damage than in the laboratory. The level of silver damage, however, remained constant. Silver damage was only influenced by daylength. All cultivars showed higher levels of silver damage under short daylength compared with long daylength. A density of 10 thlips per plant was found to be high because only 1.6 times more silver damage and 1.1 times more growth damage was found at a 4 times higher thrips density. At the highest density, many thrips died, which resulted in about the same thrips numbers for both treatments at the end of the experiment. Thrips tended to choose among cultivars. However, this did not result in a higher variance in resistance in the free-choice experiment compared with the no-choice experiment.
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Claims 11
Claim · model-written summary
Tested chrysanthemum cultivars differed significantly in the level of silver damage (old leaves) and growth damage (young leaves) caused by thrips feeding, under all test circumstances.
- Taxon
- chrysanthemum
.jpeg?width=60)
Chrysanthemume0 - Material
- tested cultivarse0
- Organ / stage
- old and young chrysanthemum leavese0
- Outcome
- level of both silver and growth damagee0
ThripsOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpeg?width=500)
Verbatim
e0“tested cultivars differed significantly in the level of both silver and growth damage caused by thrips feeding on old and young chrysanthemum leaves, respectively”
Claim · model-written summary
Chrysanthemum resistance to silver damage and to growth damage by thrips, measured under the different test circumstances, was highly correlated.
- Taxon
- ChrysanthemumChrysanthemumt0
- Outcome
- Thrips resistance to both types of feeding damagee0
- Setting
- under the different test circumstancese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thrips resistance to both types of feeding damage, measured under the different test circumstances was highly correlated”
t0“Chrysanthemum”
Claim · model-written summary
All chrysanthemum cultivars were more susceptible to growth damage by thrips in the greenhouse than in the laboratory.
- Taxon
- chrysanthemumChrysanthemume0
- Treatment
- the greenhousee0
- Outcome
- susceptible to growth damagee0
- Direction
- more susceptiblee0
- Comparator
- the laboratorye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the greenhouse, all chrysanthemum cultivars were more susceptible to growth damage than in the laboratory”
Claim · model-written summary
The level of silver damage by thrips on chrysanthemum remained constant between test locations.
- Taxon
- ChrysanthemumChrysanthemumt0
- Outcome
- level of silver damagee0
- Direction
- remained constante0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The level of silver damage, however, remained constant”
t0“Chrysanthemum”
Claim · model-written summary
All chrysanthemum cultivars showed higher levels of silver damage under short daylength than under long daylength.
- Taxon
- ChrysanthemumChrysanthemumt0
- Treatment
- short daylengthe0
- Outcome
- silver damagee0
- Direction
- highere0
- Comparator
- long daylengthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All cultivars showed higher levels of silver damage under short daylength compared with long daylength”
t0“Chrysanthemum”
Claim · model-written summary
A 4 times higher thrips density gave only 1.6 times more silver damage on chrysanthemum.
- Taxon
- ChrysanthemumChrysanthemumt0
- Treatment
- a 4 times higher thrips densitye0
- Outcome
- silver damagee0
- Direction
- moree0
- Value
- 1.6 timese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only 1.6 times more silver damage and 1.1 times more growth damage was found at a 4 times higher thrips density”
t0“Chrysanthemum”
Claim · model-written summary
A 4 times higher thrips density gave only 1.1 times more growth damage on chrysanthemum.
- Taxon
- ChrysanthemumChrysanthemumt0
- Treatment
- a 4 times higher thrips densitye0
- Outcome
- growth damagee0
- Direction
- moree0
- Value
- 1.1 timese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only 1.6 times more silver damage and 1.1 times more growth damage was found at a 4 times higher thrips density”
t0“Chrysanthemum”
Claim · model-written summary
At the highest thrips density many thrips died, giving about the same thrips numbers in both density treatments at the end of the experiment.
- Taxon
- ChrysanthemumChrysanthemumt0
- Outcome
- about the same thrips numberse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the highest density, many thrips died, which resulted in about the same thrips numbers for both treatments at the end of the experiment”
t0“Chrysanthemum”
Claim · model-written summary
Thrips tended to choose among chrysanthemum cultivars.
- Taxon
- ChrysanthemumChrysanthemumt0
- Outcome
- tended to choose among cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thrips tended to choose among cultivars”
t0“Chrysanthemum”
Claim · model-written summary
Thrips choice among cultivars did not result in a higher variance in resistance in the free-choice experiment than in the no-choice experiment.
- Taxon
- ChrysanthemumChrysanthemumt0
- Treatment
- free-choice experimente0
- Outcome
- variance in resistancee0
- Direction
- highere0
- Comparator
- no-choice experimente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this did not result in a higher variance in resistance in the free-choice experiment compared with the no-choice experiment”
t0“Chrysanthemum”
Claim · model-written summary
The authors conclude that thrips resistance measured in their standardized laboratory experiment gives a good prediction for chrysanthemum breeders selecting cultivars for thrips resistance under commercial greenhouse conditions.
- Taxon
- chrysanthemumChrysanthemume0
- Outcome
- a good predictione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“thrips resistance in chrysanthemum measured in our standardized laboratory experiment gives a good prediction for chrysanthemum breeders”
The same questions in other papers
light · pest · ChrysanthemumPositive and negative results
3 in the opposite direction
- positive
- 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.