Plant Disease (2009) 93, p. 668 (Markell et al.)

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S. Markell, T. Gulya, K. McKay, M. Hutter, C. Hollingsworth, V. Ulstad, R. Koch and A. Knudsvig (2009)
Widespread occurrence of the aecial stage of sunflower rust caused by Puccinia helianthi in North Dakota and Minnesota in 2008
Plant Disease 93 (6), 668-668
Abstract: Sunflower rust caused by Puccinia helianthi is usually observed in August in North Dakota, U.S.A. Initial inoculum is usually as urediniospores and aecia have been noted very infrequently and never widespread. During 2008, aecia of P. helianthi were common and were first observed on 24 June 2008 in a commercial sunflower field. Aecia cups were bright orange but turned brown-black as they senesced. As many as 15 aecial clusters occurred on individual leaves or cotyledons. On 4 July 2008, uredinia were first observed in the same field. At that time, uredinia, aecia, and senesced aecia could all be found on the same leaves. The early appearance of aecia suggest that the pathogen completed its sexual cycle, which can result in a greater diversity of races.
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Full text of article
Database assignments for author(s): Samuel G. Markell, Thomas J. Gulya

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology

Pest and/or beneficial records:

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

Puccinia helianthi Sunflower (Helianthus annuus) U.S.A. (mid N)