Abstract
ABSTRACT Epidemics of early leaf spot of peanut (Arachis hypogaea), caused by Cercospora arachidicola, are less severe in strip-tilled than conventionally tilled fields. Experiments were carried out to characterize the effect of strip tillage on early leaf spot epidemics and identify the primary target of suppression using a comparative epidemiology approach. Leaf spot intensity was assessed weekly as percent incidence or with the Florida 1-to-10 severity scale in peanut plots that were conventionally or strip tilled. The logistic model, fit to disease progress data, was used to estimate initial disease (y(0)) and epidemic rate (r) parameters. Environmental variables, inoculum abundance, and field host resistance were assessed independently. For experiments combined, estimated y(0) was less in strip-tilled than conventionally tilled plots, and r was comparable. The epidemic was delayed in strip-tilled plots by an average of 5.7 and 11.7 days based on incidence and severity, respectively. Tillage did not consistently affect mean canopy temperature, relative humidity, or frequency of environmental records favorable for infection or spore dispersal. Host response to infection was not affected by tillage, but infections were detected earlier and at higher frequencies with noninoculated detached leaves from conventionally tilled plots. These data suggest that strip tillage delays early leaf spot epidemics due to fewer initial infections; most likely a consequence of less inoculum being dispersed to peanut leaves from overwintering stroma in the soil.
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Claims 8
Claim · model-written summary
Initial disease was lower under strip tillage than conventional tillage.
- Taxon
- Peanut
Arachis hypogaeat0 - Treatment
- strip-tillede0
- Outcome
- estimated y(0)e0
- Direction
- lesse0
- Comparator
- conventionally tilled plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“estimated y(0) was less in strip-tilled than conventionally tilled plots”
t0“Peanut”
Claim · model-written summary
Epidemic rate was comparable between tillage systems.
- Taxon
- PeanutArachis hypogaeat0
- Treatment
- Strip Tillaget0
- Outcome
- re0
- Direction
- comparablee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“r was comparable”
t0“Strip Tillage in Peanut”
Claim · model-written summary
Strip tillage delayed incidence-based epidemic timing by 5.7 days.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The epidemic was delayed in strip-tilled plots by an average of 5.7 and 11.7 days based on incidence and severity, respectively”
t0“Peanut”
Claim · model-written summary
Strip tillage delayed severity-based epidemic timing by 11.7 days.
- Taxon
- PeanutArachis hypogaeat0
- Treatment
- strip-tillede0
- Outcome
- severitye0
- Direction
- delayede0
- Value
- 11.7 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The epidemic was delayed in strip-tilled plots by an average of 5.7 and 11.7 days based on incidence and severity, respectively”
t0“Peanut”
Claim · model-written summary
Tillage did not consistently affect canopy temperature, relative humidity, or favorable environmental records.
- Taxon
- PeanutArachis hypogaeat0
- Treatment
- Tillagee0
- Outcome
- mean canopy temperature, relative humidity, or frequency of environmental records favorable for infection or spore dispersale0
- Direction
- did not consistently affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tillage did not consistently affect mean canopy temperature, relative humidity, or frequency of environmental records favorable for infection or spore dispersal”
t0“Peanut”
Claim · model-written summary
Tillage did not affect host response to infection.
- Taxon
- PeanutArachis hypogaeat0
- Treatment
- tillagee0
- Outcome
- Host response to infectione0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Host response to infection was not affected by tillage”
t0“Peanut”
Claim · model-written summary
Infections on noninoculated detached leaves were detected earlier and more frequently from conventional plots.
- Taxon
- PeanutArachis hypogaeat0
- Organ / stage
- detached leavese0
- Treatment
- conventionally tilled plotse0
- Outcome
- infectionse0
- Direction
- higher frequenciese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“infections were detected earlier and at higher frequencies with noninoculated detached leaves from conventionally tilled plots”
t0“Peanut”
Claim · model-written summary
The authors infer that strip tillage delays epidemics through fewer initial infections, probably due to less soil stroma inoculum reaching leaves.
- Taxon
- peanutArachis hypogaeae0
- Treatment
- strip tillagee0
- Outcome
- early leaf spot epidemicse0
- Qualifier
- fewer initial infectionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“strip tillage delays early leaf spot epidemics due to fewer initial infections; most likely a consequence of less inoculum being dispersed to peanut leaves from overwintering stroma in the soil”
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tillage · disease · Arachis hypogaea (peanut)Positive and negative results
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See all 17 papers →tillage · growth · Arachis hypogaea (peanut)Positive and negative results
3 papers in the same direction as this paper · 15 in the opposite direction
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See all 19 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.