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Published on: March 10, 2020
The tomato powdery mildew fungus Oidium neolycopersici
H Jones1, J M Whipps, S J Gurr
1Department of Plant Sciences, South Parks Road, University of Oxford, Oxford, OX1 3RB, UK.
Unlabelled:
summary Pathogen: Powdery mildew fungus; Ascomycete although sexual stage is yet to be found; an obligate biotroph.
Identification:
Superficial mycelium with hyaline hyphae; unbranched erect conidiophores; conidia, ellipsoid-ovoid or doliform, 22-46 x 10-20 microm, 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.
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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