Abstract
The effects of oxygen deprivation or poor drainage and Pythium root rot on development of red rot, caused by Colletotrichum falcatum, and spring shoot population of sugarcane were evaluated under controlled and field conditions. Detached stalks of five cultivars were exposed to low atmospheric oxygen (0.5 to 2.7%), created by enclosing stalks in sealed chambers through which humidified nitrogen gas was passed for 0, 1, or 2 weeks. Stalks were then inoculated with C. falcatum and maintained for 6 weeks with humidified air flow. Red rot severity, assessed as four disease traits, was not increased by previous oxygen deprivation. In field experiments, inoculation of stalks of three cultivars with C. falcatum before planting resulted in a reduction in shoot populations the following spring. Poor drainage resulted in an additional reduction in shoot populations developing from inoculated stalks. Soil atmospheric oxygen was reduced in the root zone below planted stalks under poor drainage conditions. However, only minor reductions in oxygen were detected in the zone of elevated rows in which planted stalks were located. The detrimental effect of poor drainage on shoot populations from inoculated stalks was alleviated by metalaxyl application. Pythium root rot, caused by Pythium arrhenomanes, reduced the initial root system and growth of shoots in greenhouse experiments. The combination of P. arrhenomanes and C. falcatum inoculation increased dead bud percentage in one of two cultivars and red rot severity for both. The results suggest that spring shoot populations developing from red rot-affected stalks exposed to poor drainage can be reduced by the combined effects of red rot and Pythium root rot.
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Claims 9
Claim · model-written summary
Previous oxygen deprivation did not increase red rot severity.
- Taxon
- Sugarcanet0
- Treatment
- previous oxygen deprivatione0
- Interactor
- Colletotrichum falcatumColletotrichum falcatume1pathogen
- Outcome
- Red rot severitye0
- Direction
- not increasede0
Not reportedComparator
Verbatim
e0“Red rot severity, assessed as four disease traits, was not increased by previous oxygen deprivation.”
t0“Sugarcane Red Rot”
e1“red rot, caused by Colletotrichum falcatum”
Claim · model-written summary
C. falcatum inoculation before planting reduced spring shoot populations.
- Taxon
- Sugarcanet0
- Treatment
- inoculation of stalks of three cultivars with C. falcatum before plantinge0
- Interactor
- C. falcatumColletotrichum falcatume0pathogen
- Outcome
- shoot populationse0
- Direction
- reductione0
Not reportedComparator
Verbatim
e0“inoculation of stalks of three cultivars with C. falcatum before planting resulted in a reduction in shoot populations the following spring.”
t0“Sugarcane Red Rot”
Claim · model-written summary
Poor drainage additionally reduced shoot populations from inoculated stalks.
Not reportedComparator
Verbatim
e0“Poor drainage resulted in an additional reduction in shoot populations developing from inoculated stalks.”
t0“Sugarcane Red Rot”
Claim · model-written summary
Poor drainage lowered soil atmospheric oxygen in the root zone.
Verbatim
e0“Soil atmospheric oxygen was reduced in the root zone below planted stalks under poor drainage conditions.”
t0“Sugarcane Red Rot”
Claim · model-written summary
Oxygen reduction was minor in elevated rows containing planted stalks.
Verbatim
e0“only minor reductions in oxygen were detected in the zone of elevated rows in which planted stalks were located.”
t0“Sugarcane Red Rot”
Claim · model-written summary
Metalaxyl alleviated the drainage-related loss of shoots from inoculated stalks.
Not reportedComparator
Verbatim
e0“The detrimental effect of poor drainage on shoot populations from inoculated stalks was alleviated by metalaxyl application.”
t0“Sugarcane Red Rot”
Claim · model-written summary
Pythium root rot reduced the initial root system and shoot growth.
- Taxon
- Sugarcanet0
- Treatment
- Pythium root rote0
- Interactor
- Pythium arrhenomanesPythium arrhenomanese0pathogen
- Outcome
- initial root system and growth of shootse0
- Direction
- reducede0
- Setting
- greenhouse experimentse0
Not reportedComparator
Verbatim
e0“Pythium root rot, caused by Pythium arrhenomanes, reduced the initial root system and growth of shoots in greenhouse experiments.”
t0“Sugarcane Red Rot”
Claim · model-written summary
Combined inoculation increased dead bud percentage in one of two cultivars.
- Taxon
- Sugarcanet0
- Treatment
- The combination of P. arrhenomanes and C. falcatum inoculatione0
- Interactor
- P. arrhenomanesPythium arrhenomanese0pathogen
- Second interactor
- C. falcatumColletotrichum falcatume0pathogen
- Outcome
- dead bud percentagee0
- Direction
- increasede0
- Qualifier
- one of two cultivarse0
Not reportedComparator
Verbatim
e0“The combination of P. arrhenomanes and C. falcatum inoculation increased dead bud percentage in one of two cultivars and red rot severity for both.”
t0“Sugarcane Red Rot”
Claim · model-written summary
Combined inoculation increased red rot severity in both cultivars.
- Taxon
- Sugarcanet0
- Treatment
- The combination of P. arrhenomanes and C. falcatum inoculatione0
- Interactor
- C. falcatumColletotrichum falcatume0pathogen
- Second interactor
- P. arrhenomanesPythium arrhenomanese0pathogen
- Outcome
- red rot severitye0
- Direction
- increasede0
- Qualifier
- for bothe0
Not reportedComparator
Verbatim
e0“The combination of P. arrhenomanes and C. falcatum inoculation increased dead bud percentage in one of two cultivars and red rot severity for both.”
t0“Sugarcane Red Rot”
The same questions in other papers
Colletotrichum falcatum · pest · Saccharum officinarum (sugarcane)Results differ
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- no effect
Colletotrichum falcatum · disease · Saccharum officinarum (sugarcane)Positive and negative results
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Pythium arrhenomanes · disease · Saccharum officinarum (sugarcane)Results agree
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Pythium · growth · Saccharum officinarum (sugarcane)Results agree
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See all 10 papers →inoculation · disease · Saccharum officinarum (sugarcane)Positive and negative results
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See all 18 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.