Phytopathology (1996) 86, p. S5 (Abd-Alla et al.)

H.M. Abd-Alla, J.R. Stavely, M.F. Ouf, A.A. Gazar, Z.A. Shihata and M.M. Liebenburg (1996)
New pathogenic variability in Uromyces appendiculatus from Egypt, Honduras, South Africa, and the United States
Phytopathology 86 (11 suppl.), S5-S5
Abstract: From field urediniospore collections of Uromyces appendiculatus from beans in Egypt, Honduras, South Africa and the United States, 18 previously unidentified pathogenic races of the fungus were isolated and identified in Beltsville by specific reactions produced on the 19 standard differential cultivars. Among differential cultivars that have been resistant to most previously identified races, Mex 235, Ecuador 299, Mex 309, CSW 643, 51051, NEP-2, Olathe, AxS37, and CNC are susceptible (S) or moderately susceptible (MS) to 1, 1, 7, 3, 6, 6, 3, 4, and 1 of the 18 new races, respectively. Certain plant introductions and many released Beltsville germplasm lines that have been resistant to all races are resistant to all 18 new races. However, three of the new races from Honduras produce MS reactions on Early Gallatin (EG) and S reactions on Mex 309. These races produce MS reactions on released BARC-RR bush snap bean lines that combine the resistances of EG and Mex 309.

Research topic(s) for pests/diseases/weeds:
identification/taxonomy
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Uromyces appendiculatus		South Africa
	Uromyces appendiculatus		Egypt
	Uromyces appendiculatus		Honduras