University of Worcester Worcester Research and Publications

First Record of Oidium Anamorph of Podosphaera Xanthii on Medusagyne Oppositifolia

Pettitt, Timothy, Henricot, B., Matatiken, D. and Cook, R.T.A. (2010) First Record of Oidium Anamorph of Podosphaera Xanthii on Medusagyne Oppositifolia. Plant Pathology, 59 (6). p. 1168. ISSN Online: 1365-3059

Full text not available from this repository.


Powdery mildew first appeared on mature 3-year-old bushes of ‘jellyfish tree’, Medusagyne oppositifolia (Medusagynaceae), grown from seed at Eden Project, Cornwall, England, in collaborative conservation work
with the Seychelles Government. Initially, young leaves showed distortion and patches of mycelium bearing conidia. Later, light brown lesions developed and badly affected plants showed extensive leaf-drop, especially destructive in seedlings. This is the first report of powdery mildew
on Medusagyne. Conidia are catenate, elliptical to doliiform, (19) 24–34(47Æ5) · (13Æ5) 15–18 lm with fibrosin bodies and a sinuous wrinkling pattern. Conidiophores erect with a long cylindrical straight or twisted foot-cell, 41–86Æ5 (140) · (7) 9–14 (16) lm, arising towards one end of
its hyphal mother cell, the lower septum occasionally raised up to 10 lm, followed by a generative cell and 2–5 maturing conidial units. Superficial hyphal cells, 25–105 · 4Æ5–11Æ5 lm, branched at right angles, bearing
inconspicuous or slightly nipple-shaped appressoria. No chasmothecia were present, but characteristics are consistent with Oidium subgenus Fibroidium, the anamorph of Podosphaera. The short, broad germ tubes typical of the fibroidium type, brevitubus subtype narrowed the identification to Podosphaera section Sphaerotheca subsect. Magnicellulatae (Cook & Braun, 2009) with the morphology close to that of Podosphaera (syn. Sphaerotheca) fusca, apparently a ubiquitous species with a broad host range.

Item Type: Article
Additional Information:

The full-text can be accessed via the official URL.

Originally deposited as National Pollen and Aerobiology Research Unit (NPARU)

Subjects: Q Science > Q Science (General)
Divisions: College of Health, Life and Environmental Sciences > School of Science and the Environment
Related URLs:
Depositing User: Sally Wall
Date Deposited: 24 Feb 2015 16:50
Last Modified: 26 Nov 2019 11:28

Actions (login required)

View Item View Item
Worcester Research and Publications is powered by EPrints 3 which is developed by the School of Electronics and Computer Science at the University of Southampton. More information and software credits.