European Journal of Plant Pathology (1996) 102, 823-830

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Thomas Miedaner and Angela G. Schilling (1996)
Genetic variation of aggressiveness in individual field populations of Fusarium graminearum and Fusarium culmorum tested on young plants of winter rye
European Journal of Plant Pathology 102 (9), 823-830
Abstract: Fusarium graminearum and F. culmorum are capable of infecting winter cereals at all growth stages. From natural field epidemics of wheat head blight and rye foot rot, three fungal populations were collected with 21, 38 and 54 isolates, respectively; their aggressiveness was analyzed in comparison to collections of F. graminearum (25 isolates) and F. culmorum (70 isolates) that represent a wide range of geographical locations and host species. All isolates were tested for aggressiveness on young plants of winter rye in the greenhouse and scored for disease severity on a 1-9 scale. Disease ratings of individual isolates ranged from 1.5 to 5.7 indicating quantitative variation of aggressiveness. Genotypic variance was highest in the two Fusarium collections. No substantial difference was found in the amount of genotypic variation between F. graminearum and F. culmorum. Individual field populations revealed 57-66% of the total genotypic variation of the collections. This implies a high degree of diversity of aggressiveness within single field populations of F. graminearum and F. culmorum causing natural epidemics.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website

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

Pest and/or beneficial records:

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

Fusarium culmorum Rye (Secale cereale)
Fusarium graminearum Rye (Secale cereale)