Plant Disease (2002) 86, p. 564 (Gulya et al.)

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T.J. Gulya and L.D. Charlet (2002)
First report of Puccinia xanthii on sunflower in North America
Plant Disease 86 (5), 564-564
Abstract: During 1999, oilseed sunflower (Helianthus annuus) grown in North Dakota, USA was observed with symptoms of large, raised, chlorotic pustules on the adaxial leaf surface. Approximately 10% of sunflower plants were affected. The fungus Puccinia xanthii (cocklebur rust) was isolated from the diseased plants. The identification was based on morphological characteristics. The fungus is known to infect sunflower in other countries and rust-infected cocklebur plants were collected several kilometers away. Teliospores from cocklebur were morphologically similar to those from sunflower and can be easily distinguished from the ubiquitous P. helianthi.
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Database assignments for author(s): Thomas J. Gulya

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution
non-target effects/fate in environm.

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Xanthium strumarium (weed) U.S.A. (NW)
Puccinia xanthii (weed pathogen) Xanthium strumarium (weed) U.S.A. (NW)