Abstract
The density of beet eelworm (Heterodera schachtii) was estimated annually for 4 years in a field with non-host crops after a beet crop had shown symptoms of attack. Rivanol proved to be satisfactory for the estimation of beet eelworm. There was little correlation between severity of symptoms in the beet crop and the final density of eelworm. Normal cultivations caused an appreciable movement of cysts in the soil. The rate of decline was independant of eelworm density, and was less in the first year than in the next two. It is suggested that two processes control beet eelworm numbers: intra-specific competition within host roots, and the effects of the physical environment on emergence.
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Claims 6
Claim · model-written summary
Rivanol gave satisfactory estimates of beet eelworm density.
- Taxon
- Beet
Beta vulgarist0 - Interactor
- beet eelworme0pest
- Outcome
- estimation of beet eelworme0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Beet”
e0“Rivanol proved to be satisfactory for the estimation of beet eelworm.”
Claim · model-written summary
Beet symptom severity had little correlation with final eelworm density.
- Taxon
- beet cropBeta vulgarise0
- Interactor
- eelworme0pest
- Outcome
- severity of symptoms in the beet crope0
- Qualifier
- little correlatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Beet”
e0“There was little correlation between severity of symptoms in the beet crop and the final density of eelworm.”
Claim · model-written summary
Normal cultivation moved cysts appreciably through soil.
- Taxon
- BeetBeta vulgarist0
- Treatment
- Normal cultivationse0
- Interactor
- beet eelworme1pest
- Outcome
- movement of cysts in the soile0
- Direction
- appreciablee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Beet”
e0“Normal cultivations caused an appreciable movement of cysts in the soil.”
e1“Rivanol proved to be satisfactory for the estimation of beet eelworm.”
Claim · model-written summary
Eelworm decline rate was independent of eelworm density.
- Taxon
- BeetBeta vulgarist0
- Interactor
- eelworme0pest
- Outcome
- rate of declinee0
- Direction
- independante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Beet”
e0“The rate of decline was independant of eelworm density, and was less in the first year than in the next two.”
Claim · model-written summary
Eelworm decline was slower in the first year than in the following two years.
- Taxon
- BeetBeta vulgarist0
- Interactor
- eelworme0pest
- Outcome
- rate of declinee0
- Direction
- lesse0
- Comparator
- next twoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Beet”
e0“The rate of decline was independant of eelworm density, and was less in the first year than in the next two.”
Claim · model-written summary
The authors proposed within-host competition and physical conditions as controls on eelworm numbers.
- Taxon
- BeetBeta vulgarist0
- Interactor
- beet eelworme0pest
- Outcome
- beet eelworm numberse0
- Qualifier
- intra-specific competition within host roots, and the effects of the physical environment on emergencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Beet”
e0“two processes control beet eelworm numbers: intra-specific competition within host roots, and the effects of the physical environment on emergence.”