Population Dynamics of Fusarium spp. and Microdochium nivale in Crops and Crop Residues of Winter Wheat

Naturally occurring populations of Fusarium avenaceum, F. culmorum, F. graminearum, F. poae, and Microdochium nivale were studied in two field experiments from anthesis in June 2003 until harvest in crops of winter wheat, and subsequently during 10 months after harvest until June 2004 on their resid...

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Bibliographic Details
Published in:Phytopathology 2007-08, Vol.97 (8), p.971-978
Main Authors: Kohl, J, Haas, B.H. de, Kastelein, P, Burgers, S.L.G.E, Waalwijk, C
Format: Article
Language:English
Subjects:
Biological and medical sciences
cereals
colonization
contamination
crop residues
cyclamen
DNA fingerprinting
Fundamental and applied biological sciences. Psychology
fungal diseases of plants
Fungal plant pathogens
Fusarium avenaceum
Fusarium culmorum
Fusarium poae
Gibberella avenacea
Gibberella zeae
graminearum
head blight
inoculum density
inoculum production
Microdochium nivale
Monographella nivalis
pathogenicity
Phytopathology. Animal pests. Plant and forest protection
plant pathogenic fungi
polymerase chain reaction
population dynamics
survival
temporal variation
Triticum aestivum
ulocladium-atrum
winter wheat
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Summary:Naturally occurring populations of Fusarium avenaceum, F. culmorum, F. graminearum, F. poae, and Microdochium nivale were studied in two field experiments from anthesis in June 2003 until harvest in crops of winter wheat, and subsequently during 10 months after harvest until June 2004 on their residues exposed on the soil surface under field conditions. The dynamics of the different pathogens were estimated by quantifying the amount of DNA present in wheat tissues using TaqMan-polymerase chain reaction. While colonization of grain by Fusarium spp. and M. nivale was low, high amounts of DNA of F. avenaceum, F. graminearum, and F. culmorum were found in ear residues, internodes, and nodes of the mature crop. Amounts of DNA of pathogens decreased significantly during the following 10 months in residues of internodes and nodes, but not in residues of stem bases. Knowledge on population dynamics of pathogens will help to develop preventive measures aimed at reduction of inoculum sources of head blight pathogens.
ISSN:0031-949X
1943-7684
DOI:10.1094/PHYTO-97-8-0971