The tomato powdery mildew fungus Oidium neolycopersici
Hannah Jones1, John M. Whipps2, and Sarah Jane Gurr1
1 Department of Plant Sciences, South Parks Road, University of
Oxford, Oxford, OX1 3RB, UK,
2 Horticulture Research International, Wellesbourne, Warwick, CV35
9EF, UK
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| Summary: |
Powdery mildew fungus; Ascomycete although sexual stage is yet to be
found; an obligate biotroph.
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| Identification: |
Superficial mycelium with hyaline
hyphae; unbranched erect conidiophores; conidia, ellipsoid-ovoid or
doliform, 22-46 x 10-20 µm, lack fibrosin bodies; conidia formed singly,
rarely in short chains of 2-6 conidia; appressoria lobed to multilobed,
rarely nipple-shaped. Pseudoidium species. |
| Host range: |
Broad, reported to attack over 60
species in 13 plant families, particularly members of the Solanaceae and
Curcubitaceae. |
| Disease symptoms: |
Powdery white lesions on all aerial
plant parts except the fruit. In severe outbreaks the lesions coalesce and
disease is debilitating. |
| Agronomic importance: |
Extremely common in glasshouse
tomatoes world wide but increasing in importance on field grown tomato
crops. |
| Control: |
Chemical control and breeding
programmes for disease resistance. |
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Powdery white lesions of O. neolycopersici on tomato (var.
Moneymaker) leaves but the fruit is uninfected.
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Paired hyphal appressoria
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Two conidiophores bearing a single
apical and near mature ellipsoidal
conidium
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