Plant Disease (2015) 99, p. 160 (Mathew et al.)

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F.M. Mathew, K.Y. Rashid, T.J. Gulya and S.G. Markell (2015)
First report of Phomopsis stem canker of sunflower (Helianthus annuus) caused by Diaporthe gulyae in Canada
Plant Disease 99 (1), 160-160
Abstract: During 2012, sunflower plants (Helianthus annuus) grown in Manitoba, Canada were observed with symptoms of elongated, brown-black lesions surrounding the leaf petiole, with numerous pycnidia, pith damage, and mid-stem lodging. About 15% of the plants in a field were affected. The fungus Diaporthe gulyae was isolated from the diseased plants. The identification was based on morphological characteristics and DNA sequence analysis. Pathogenicity of the isolates was demonstrated by inoculation and re-isolation.
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Full text of article
Database assignments for author(s): Thomas J. Gulya, Samuel G. Markell

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

Pest and/or beneficial records:

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

Diaporthe gulyae Sunflower (Helianthus annuus) Canada (west)