Abstract
SUMMARY A halo‐blight epidemic model based on the equation of Van der Plank (1963) is described. The model has been used to determine tolerance levels for seed infection and to compare the effectiveness of chemical control measures based on foliar sprays and seed treatments. Reduction of primary inoculum, derived from infected seed, by disease exclusion through seed testing, or by chemical seed treatment will give effective disease control under British conditions (i.e. with an expected apparent infection rate ( r ) of 0.15 per infected plant per day). Under climatic conditions more favourable for the disease where higher r values would occur, control treatments directed against primary inoculum only would be less effective. Under such conditions, it is predicted that chemical sprays, which have no effect on primary inoculum but cause a reduction in the rate of disease increase, would be more effective. The most effective disease control, however, would be a combination of treatments.
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Claims 7
Claim · model-written summary
A halo-blight epidemic model based on Van der Plank's equation was described.
Not reportedComparator
Verbatim
e0“A halo‐blight epidemic model based on the equation of Van der Plank (1963) is described.”
t0“beans”
Claim · model-written summary
Seed testing for disease exclusion is predicted to control bean halo-blight effectively under British conditions.
- Taxon
- beanst0
- Treatment
- disease exclusion through seed testinge0
- Outcome
- disease controle0
- Direction
- effectivee0
- Qualifier
- 0.15 per infected plant per daye0
- Setting
- British conditionse0
Not reportedComparator
Verbatim
e0“Reduction of primary inoculum, derived from infected seed, by disease exclusion through seed testing, or by chemical seed treatment will give effective disease control under British conditions (i.e. with an expected apparent infection rate ( r ) of 0.15 per infected plant per day).”
t0“beans”
Claim · model-written summary
Chemical seed treatment is predicted to control bean halo-blight effectively under British conditions.
- Taxon
- beanst0
- Treatment
- chemical seed treatmente0
- Outcome
- disease controle0
- Direction
- effectivee0
- Qualifier
- 0.15 per infected plant per daye0
- Setting
- British conditionse0
Not reportedComparator
Verbatim
e0“Reduction of primary inoculum, derived from infected seed, by disease exclusion through seed testing, or by chemical seed treatment will give effective disease control under British conditions (i.e. with an expected apparent infection rate ( r ) of 0.15 per infected plant per day).”
t0“beans”
Claim · model-written summary
Primary-inoculum-only treatments would be less effective under climates favoring higher infection rates.
- Taxon
- beanst0
- Treatment
- control treatments directed against primary inoculum onlye0
- Outcome
- less effectivee0
- Direction
- less effectivee0
- Qualifier
- climatic conditions more favourable for the diseasee0
Not reportedComparator
Verbatim
e0“Under climatic conditions more favourable for the disease where higher r values would occur, control treatments directed against primary inoculum only would be less effective.”
t0“beans”
Claim · model-written summary
Chemical sprays would be more effective under disease-favorable conditions by reducing disease increase without affecting primary inoculum.
Not reportedComparator
Verbatim
e0“Under such conditions, it is predicted that chemical sprays, which have no effect on primary inoculum but cause a reduction in the rate of disease increase, would be more effective.”
t0“beans”
Claim · model-written summary
Chemical sprays are predicted to have no effect on primary inoculum.
Not reportedComparator
Verbatim
e0“chemical sprays, which have no effect on primary inoculum but cause a reduction in the rate of disease increase, would be more effective.”
t0“beans”
Claim · model-written summary
Combining treatments would provide the most effective disease control.
Not reportedComparator
Verbatim
e0“The most effective disease control, however, would be a combination of treatments.”
t0“beans”
The same questions in other papers
seed treatment · control · Phaseolus vulgaris (common bean)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 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.