Abstract
Rice blast, caused by Pyricularia grisea, was first found in California in 1996. Disease surveys have shown the blast disease is spreading at a moderate rate in California rice fields. Although no effective major resistance genes are known to occur in widely grown commercial California cultivars, there appear to be differences among the cultivars with respect to field susceptibility to the pathogen. P. grisea was recovered from rice crop residue and commercial seedlots which are suggested as possible sources of initial P. grisea inoculum in California rice fields. Examination of weather data indicates that environmental conditions in California rice-producing areas are permissive for rice blast but generally not optimal for epidemic development. Spore trapping determined that the majority of P. grisea conidia are generally not released until approximately 6:00 A.M. and would not have sufficient time for infection before leaf wetness periods end. Azoxystrobin showed positive results with respect to reduction of neck blast incidence and yield increases in small-plot and large-scale fungicide trials.
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Claims 11
Claim · model-written summary
Rice blast was first found in California in 1996.
- Taxon
- Rice
Oryza sativae0 - Interactor
- Pyricularia grisea
Pyricularia griseae0pathogene1 - Outcome
- blaste0
- Setting
- Californiae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice blast, caused by Pyricularia grisea, was first found in California in 1996”
e1“pathogen”
Claim · model-written summary
Rice blast spread at a moderate rate in California rice fields.
- Taxon
- riceOryza sativae0
- Outcome
- blast diseasee0
- Direction
- spreading at a moderate ratee0
- Setting
- California rice fieldse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Disease surveys have shown the blast disease is spreading at a moderate rate in California rice fields”
Claim · model-written summary
Widely grown California rice cultivars have no known effective major blast resistance genes.
- Taxon
- RiceOryza sativat0
- Material
- commercial California cultivarse0
- Outcome
- effective major resistance genese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no effective major resistance genes are known to occur in widely grown commercial California cultivars”
t0“Rice”
Claim · model-written summary
California rice cultivars differed in field susceptibility to the pathogen.
- Taxon
- RiceOryza sativat0
- Material
- cultivarse0
- Outcome
- field susceptibilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there appear to be differences among the cultivars with respect to field susceptibility to the pathogen”
t0“Rice”
Claim · model-written summary
Pyricularia grisea was recovered from rice crop residue and commercial seedlots.
- Taxon
- riceOryza sativae0
- Organ / stage
- crop residue and commercial seedlotse0
- Interactor
- P. griseaPyricularia griseae0pathogene1
- Outcome
- P. grisea was recoverede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. grisea was recovered from rice crop residue and commercial seedlots”
e1“pathogen”
Claim · model-written summary
Rice crop residue and commercial seedlots were suggested as possible initial inoculum sources.
- Taxon
- riceOryza sativae0
- Interactor
- P. griseaPyricularia griseae0pathogene1
- Outcome
- possible sources of initial P. grisea inoculume0
- Setting
- California rice fieldse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice crop residue and commercial seedlots which are suggested as possible sources of initial P. grisea inoculum in California rice fields”
e1“pathogen”
Claim · model-written summary
California rice-area weather was permissive but generally not optimal for blast epidemics.
- Taxon
- riceOryza sativae0
- Outcome
- permissive for rice blast but generally not optimal for epidemic developmente0
- Setting
- California rice-producing arease0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“environmental conditions in California rice-producing areas are permissive for rice blast but generally not optimal for epidemic development”
Claim · model-written summary
Most P. grisea conidia were not released until about 6 AM.
- Taxon
- RiceOryza sativat0
- Interactor
- P. griseaPyricularia griseae0pathogene1
- Outcome
- P. grisea conidia are generally not releasede0
- Value
- approximately 6:00 A.M.e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the majority of P. grisea conidia are generally not released until approximately 6:00 A.M.”
t0“Rice”
e1“pathogen”
Claim · model-written summary
Conidia released around 6 AM lacked sufficient time for infection before leaf wetness ended.
- Taxon
- RiceOryza sativat0
- Outcome
- not have sufficient time for infectione0
- Qualifier
- before leaf wetness periods ende0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“would not have sufficient time for infection before leaf wetness periods end”
t0“Rice”
Claim · model-written summary
Azoxystrobin reduced rice neck blast incidence in fungicide trials.
- Taxon
- RiceOryza sativat0
- Treatment
- Azoxystrobine0
- Outcome
- neck blast incidencee0
- Direction
- reductione0
- Setting
- small-plot and large-scale fungicide trialse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Azoxystrobin showed positive results with respect to reduction of neck blast incidence and yield increases in small-plot and large-scale fungicide trials”
t0“Rice”
Claim · model-written summary
Azoxystrobin increased rice yield in fungicide trials.
- Taxon
- RiceOryza sativat0
- Treatment
- Azoxystrobine0
- Outcome
- yielde0
- Direction
- increasese0
- Setting
- small-plot and large-scale fungicide trialse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Azoxystrobin showed positive results with respect to reduction of neck blast incidence and yield increases in small-plot and large-scale fungicide trials”
t0“Rice”
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See all 20 papers →azoxystrobin · yield · Oryza sativa (rice)Results agree
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See all 20 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.