Plant Disease (2017) 101, p. 382 (Olson et al.)

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T.R. Olson, B. Kontz, S.G. Markell, T.J. Gulya and F.M. Mathew (2017)
First report of Diaporthe stewartii causing Phomopsis stem canker of sunflower (Helianthus annuus) in Minnesota
Plant Disease 101 (2), 382-382
Abstract: During 2015, sunflower plants (Helianthus annuus) grown in Minnesota, U.S.A. were observed with symptoms of elongated, brown stem lesions. The fungus Diaporthe stewartii 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 helianthi Sunflower (Helianthus annuus) U.S.A. (mid N)
Diaporthe stewartii Sunflower (Helianthus annuus) U.S.A. (mid N)