Abstract
In September 1996 and 1997, diseased tomato seedlings were observed with symptoms of an aerial watery rot on leaves, petioles, and stems. Tomato cvs. Sanibel and 10097 from commercial fields in southwest Florida (Collier and Lee counties) and west central Florida (Manatee County) exhibited similar symptoms that occurred at an incidence of 15 to 18% about 4 weeks after transplanting and resulted in plant death. Microscopic examination of symptomatic tissue revealed the presence of mycelium and oogonia typical of Pythium spp. A fungus was consistently isolated from four plants sampled from each site onto a medium selective for Pythium spp. and maintained in pure culture on V8 juice agar at 28°C. The isolates were identified as Pythium myriotylum Drechs. based on the following morphological data: lobate sporangium, 12 to 13 μm wide; vesicle 15.4 to 19.4 μm in diameter; exit tube 54 to 90 μm long, oogonium 23 to 30 μm in diameter; and oospore 21 to 26 μm in diameter (1,2). Pathogenicity tests were conducted with two isolates from diverse regions within Florida by spray inoculating the leaves and shoots of 6- to 8-week-old tomato seedlings with a sporangial suspension of 1 × 10 4 sporangia per ml. Noninoculated plants served as controls. Plants had 24 h of pre- and post-dark period, day/night temperatures of 28/21°C, a 14-h photoperiod, and near 100% relative humidity in a growth chamber. The foliage of inoculated tomato plants exhibited symptoms identical to those observed in field samples 24 h after inoculation and 100% mortality within 72 h. The reisolated fungus was morphologically identical to the original isolate. Noninoculated plants remained asymptomatic. The unusual rainfall recorded at some sites, such as in Manatee County in September 1997, was 36% higher than the 40-year average and may have contributed to the incidence of this previously undescribed foliar blight. References: (1) Anonymous. C.M.I. Descriptions of Pathogenic Fungi and Bacteria No. 118. (2) T. Watanabe. Pictorial Atlas of Soil Fungi. Lewis Pub., London. p. 71.
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Claims 8
Claim · model-written summary
Tomato seedlings had aerial watery rot on leaves, petioles and stems.
- Taxon
- tomato
Solanum lycopersicume0 - Organ / stage
- leaves, petioles, and stemse0
- Outcome
- aerial watery rote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“diseased tomato seedlings were observed with symptoms of an aerial watery rot on leaves, petioles, and stems”
Claim · model-written summary
Affected Florida cultivars had 15 to 18% incidence around four weeks after transplanting and plant death.
- Taxon
- TomatoSolanum lycopersicume0
- Material
- Sanibel and 10097e0
- Outcome
- incidencee0
- Value
- 15 to 18%e0
- Qualifier
- about 4 weeks after transplantinge0
- Setting
- southwest Floridae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato cvs. Sanibel and 10097 from commercial fields in southwest Florida (Collier and Lee counties) and west central Florida (Manatee County) exhibited similar symptoms that occurred at an incidence of 15 to 18% about 4 weeks after transplanting and resulted in plant death”
Claim · model-written summary
The isolates were identified as Pythium myriotylum.
- Taxon
- TomatoSolanum lycopersicumt0
- Interactor
- Pythium myriotylumPythium myriotylume0pathogen
- Outcome
- isolates were identified as Pythium myriotylume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The isolates were identified as Pythium myriotylum Drechs.”
t0“on Tomato”
Claim · model-written summary
Inoculated tomato foliage developed field-like symptoms within 24 hours.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- foliagee0
- Treatment
- inoculatede0
- Outcome
- symptoms identical to those observed in field samplese0
- Value
- 24 he0
- Comparator
- field samplese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The foliage of inoculated tomato plants exhibited symptoms identical to those observed in field samples 24 h after inoculation”
Claim · model-written summary
Inoculated tomato plants reached 100% mortality within 72 hours.
- Taxon
- TomatoSolanum lycopersicumt0
- Interactor
- Pythium myriotylumPythium myriotylumt1pathogen
- Outcome
- mortalitye0
- Direction
- higherinferrede0
- Value
- 100%e0
- Qualifier
- within 72 he0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“100% mortality within 72 h”
t0“on Tomato”
t1“Pythium myriotylum”
Claim · model-written summary
The reisolated fungus matched the original isolate morphologically.
- Taxon
- TomatoSolanum lycopersicumt0
- Interactor
- Pythium myriotylumPythium myriotylumt1pathogen
- Outcome
- morphologically identicale0
- Comparator
- original isolatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reisolated fungus was morphologically identical to the original isolate”
t0“on Tomato”
t1“Pythium myriotylum”
Claim · model-written summary
Noninoculated plants remained asymptomatic.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- Noninoculatede0
- Outcome
- asymptomatice0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Noninoculated plants remained asymptomatic”
t0“on Tomato”
Claim · model-written summary
Unusual rainfall may have contributed to this blight incidence.
- Taxon
- TomatoSolanum lycopersicumt0
- Outcome
- incidence of this previously undescribed foliar blighte0
- Qualifier
- unusual rainfalle0
- Setting
- Manatee Countye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The unusual rainfall recorded at some sites, such as in Manatee County in September 1997, was 36% higher than the 40-year average and may have contributed to the incidence of this previously undescribed foliar blight”
t0“on Tomato”
The same questions in other papers
inoculation · disease · Solanum lycopersicum (tomato)Positive and negative results
129 papers in the same direction as this paper · 136 in the opposite direction
- positive
- positive
- positive
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See all 266 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.