Abstract
Anthracnose fruit rot (AFR), caused by Colletotrichum acutatum, is a major disease of strawberry in Florida and is generally controlled by weekly fungicide applications. More than 20 applications may be made during the growing season, most commonly using captan and the quinone-outside inhibitors. Field experiments were conducted for three seasons on a susceptible and a partially resistant cultivar to evaluate the effectiveness of timing fungicide applications for managing AFR based on a previously published model by Wilson and associates that uses leaf wetness duration and temperature to predict fruit infection by C. acutatum under controlled conditions. For most treatments, rules were established where captan was applied when the predicted proportion of fruit infected (INF) from the model exceeded 0.15 and pyraclostrobin was applied when INF exceeded 0.5. For one model-timed treatment where captan and pyraclostrobin were applied before symptoms first appeared in the field, disease control was as good as the treatment where calendar weekly applications were made and the model-timed treatment utilized 47% fewer sprays. In treatments where fungicide application began after symptom appearance, the number of applications was reduced further but disease control was 40% less effective. Model-timed fungicide treatments that included pyraclostrobin gave better control than the treatments using captan alone. The model relating leaf wetness and temperature to predict AFR infection can be used effectively in a disease-forecasting system to time fungicide treatments and greatly reduce the number of applications without loss of disease control or yield.
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Claims 6
Claim · model-written summary
Pre-symptom model-timed sprays controlled strawberry fruit rot as well as weekly sprays.
- Taxon
- strawberry
_single2.jpg?width=60)
Fragaria ×ananassat0 - Treatment
- captan and pyraclostrobine0
- Interactor
- Colletotrichum acutatum
Colletotrichum acutatumt1pathogen - Outcome
- disease controle0
- Direction
- as good ase0
- Comparator
- calendar weekly applicationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_single2.jpg?width=500)
Verbatim
e0“For one model-timed treatment where captan and pyraclostrobin were applied before symptoms first appeared in the field, disease control was as good as the treatment where calendar weekly applications were made”
t0“Strawberry”
t1“Colletotrichum acutatum”
Claim · model-written summary
Pre-symptom model timing used 47% fewer sprays than weekly applications.
- Taxon
- strawberryFragaria ×ananassat0
- Outcome
- sprayse0
- Direction
- fewere0
- Value
- 47%e0
- Comparator
- weekly applicationst1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the model-timed treatment utilized 47% fewer sprays”
t0“Strawberry”
t1“weekly applications”
Claim · model-written summary
Starting fungicide after symptom appearance reduced application numbers further.
- Taxon
- strawberryFragaria ×ananassat0
- Treatment
- fungicide application began after symptom appearancee0
- Outcome
- number of applicationse0
- Direction
- reduced furthere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In treatments where fungicide application began after symptom appearance, the number of applications was reduced further but disease control was 40% less effective.”
t0“Strawberry”
Claim · model-written summary
Starting after symptoms gave 40% less effective disease control.
- Taxon
- strawberryFragaria ×ananassat0
- Treatment
- fungicide application began after symptom appearancee0
- Interactor
- Colletotrichum acutatumColletotrichum acutatumt1pathogen
- Outcome
- disease controle0
- Direction
- less effectivee0
- Value
- 40%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In treatments where fungicide application began after symptom appearance, the number of applications was reduced further but disease control was 40% less effective.”
t0“Strawberry”
t1“Colletotrichum acutatum”
Claim · model-written summary
Model-timed treatments including pyraclostrobin controlled disease better than captan alone.
- Taxon
- strawberryFragaria ×ananassat0
- Treatment
- pyraclostrobine0
- Interactor
- Colletotrichum acutatumColletotrichum acutatumt1pathogen
- Outcome
- controle0
- Direction
- bettere0
- Comparator
- captan alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Model-timed fungicide treatments that included pyraclostrobin gave better control than the treatments using captan alone.”
t0“Strawberry”
t1“Colletotrichum acutatum”
Claim · model-written summary
The forecast model can time sprays with fewer applications without loss of disease control or yield.
- Taxon
- strawberryFragaria ×ananassat0
- Interactor
- Colletotrichum acutatumColletotrichum acutatumt1pathogen
- Outcome
- reduce the number of applications without loss of disease control or yielde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The model relating leaf wetness and temperature to predict AFR infection can be used effectively in a disease-forecasting system to time fungicide treatments and greatly reduce the number of applications without loss of disease control or yield.”
t0“Strawberry”
t1“Colletotrichum acutatum”
The same questions in other papers
pyraclostrobin · Colletotrichum acutatum · Fragaria x ananassa (strawberry)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
fungicide · Colletotrichum acutatum · Fragaria x ananassa (strawberry)Positive and negative results
4 in the opposite direction
- 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.