Abstract
Tomato plants showing typical signs of powdery mildew were received in April 2006 from a hydroponic greenhouse situated in western Turkey. Dense, irregular white patches observed on the upper surfaces of the leaves and on the stems of the plants could be easily differentiated from the symptoms caused by Leveillula taurica. This species is known as the unique agent of tomato powdery mildew in Turkey up to now and causes white powdery masses appearing just under the chlorotic spots that are produced on the adaxial surface of the leaves. To determine the morphological characteristics of the pathogen, surface mycelium was removed with small strips of clear adhesive tape and examined using light microscopy. Microscopic observations revealed ellipsoid-ovoid or doliform conidia that measured 31–57 × 15–27 µm (mean 33·7 × 17·4 µm; n = 50) germinating with one short germ tube terminating in simple apices. Conidiophores were straight, with cylindrical foot-cells measuring 47–78 µm (mean 53·8 µm), followed by two or three short cells. The total length of the conidiophores measured 73–104 µm (mean 87·4 µm). Conidia were solitary or sometimes in short pseudo-chains of 2–4 conidia. Based on these characteristics the fungus was identified as Oidium neolycopersici (Kiss et al., 2001). To confirm the pathogenicity of the fungus, disease free tomatoes plants (20 plants each of cvs SC 2121 and H 2274) were inoculated at the five to six true-leaf stage with conidia falling from diseased tomato leaves hanging above them. Plants were kept in a polyethylene chamber placed in a greenhouse cabinet at 21 ± 1°C and a 14-h photoperiod for 5 days. The polyethylene chamber was then removed and the plants were grown in the greenhouse. The first white fungal colonies appeared on the leaves of the inoculated plants 7 days after inoculation and after 14 days, a powdery mildew, exhibiting the same morphological features, was observed on all of the inoculated tomatoes plants. This is the first report of powdery mildew caused by Oidium neolycopersici on tomatoes in Turkey. This disease has the potential to cause economic losses (Jones et al., 2001) and may become a problem in greenhouse-grown tomatoes in the near future.
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Claims 8
Claim · model-written summary
Tomato plants in western Turkey showed white patches of powdery mildew on leaves and stems.
- Taxon
- plantsViridiplantaee0
- Organ / stage
- leaves and on the stemse0
- Interactor
- Oidium neolycopersiciErysiphe neolycopersicit0pathogen
- Outcome
- Dense, irregular white patchese0
Verbatim
e0“Dense, irregular white patches observed on the upper surfaces of the leaves and on the stems of the plants”
t0“Oidium neolycopersici on tomatoes in Turkey”
Claim · model-written summary
The fungus on tomato was identified as Oidium neolycopersici from its morphology.
- Taxon
- tomatoes
Solanum lycopersicumt0 - Interactor
- Oidium neolycopersiciErysiphe neolycopersicie0pathogen
- Outcome
- fungus was identified as Oidium neolycopersicie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Based on these characteristics the fungus was identified as Oidium neolycopersici”
t0“Oidium neolycopersici on tomatoes in Turkey”
Claim · model-written summary
Conidia of the tomato powdery mildew fungus measured 31–57 × 15–27 µm.
- Taxon
- tomatoesSolanum lycopersicumt0
- Interactor
- Oidium neolycopersiciErysiphe neolycopersicit0pathogen
- Outcome
- conidiae0
- Value
- 31–57 × 15–27 µme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ellipsoid-ovoid or doliform conidia that measured 31–57 × 15–27 µm”
t0“Oidium neolycopersici on tomatoes in Turkey”
Claim · model-written summary
Conidiophore foot cells of the tomato fungus measured 47–78 µm.
- Taxon
- tomatoesSolanum lycopersicumt0
- Interactor
- Oidium neolycopersiciErysiphe neolycopersicit0pathogen
- Outcome
- cylindrical foot-cellse0
- Value
- 47–78 µme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cylindrical foot-cells measuring 47–78 µm”
t0“Oidium neolycopersici on tomatoes in Turkey”
Claim · model-written summary
Tomato fungal conidiophores measured 73–104 µm.
- Taxon
- tomatoesSolanum lycopersicumt0
- Interactor
- Oidium neolycopersiciErysiphe neolycopersicit0pathogen
- Outcome
- total length of the conidiophorese0
- Value
- 73–104 µme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“total length of the conidiophores measured 73–104 µm”
t0“Oidium neolycopersici on tomatoes in Turkey”
Claim · model-written summary
Fungal colonies appeared seven days after inoculation of tomato plants.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- inoculatione0
- Interactor
- Oidium neolycopersiciErysiphe neolycopersicit0pathogen
- Outcome
- first white fungal colonies appearede0
- Value
- 7 dayse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The first white fungal colonies appeared on the leaves of the inoculated plants 7 days after inoculation”
t0“Oidium neolycopersici on tomatoes in Turkey”
Claim · model-written summary
Powdery mildew developed on all inoculated tomato plants after 14 days.
- Taxon
- tomatoesSolanum lycopersicume0
- Treatment
- inoculatede0
- Interactor
- Oidium neolycopersiciErysiphe neolycopersicit0pathogen
- Outcome
- powdery mildewe0
- Value
- 14 dayse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after 14 days, a powdery mildew, exhibiting the same morphological features, was observed on all of the inoculated tomatoes plants”
t0“Oidium neolycopersici on tomatoes in Turkey”
Claim · model-written summary
This was the first report of Oidium neolycopersici powdery mildew on tomatoes in Turkey.
- Taxon
- tomatoesSolanum lycopersicume0
- Interactor
- Oidium neolycopersiciErysiphe neolycopersicie0pathogen
- Outcome
- first report of powdery mildewe0
- Setting
- Turkeye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This is the first report of powdery mildew caused by Oidium neolycopersici on tomatoes in Turkey”
The same questions in other papers
inoculation · Erysiphe neolycopersici · Solanum lycopersicum (tomato)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
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.