Fungal attack on wheat roots and successions of pathogenic fungi in wheat
1994
Fehrmann, H. (Goettingen Univ. (Germany). Inst. fuer Pflanzenpathologie und Pflanzenschutz) | Allam, A.D.A. | Manthey, R. | Krueger, W.
In two winter wheat fields at two different locations and with two different crop rotations each with a different wheat history, during two successive years and at different plant stages a survey was made for fungal attack of wheat roots. Mainly at a more advanced plant stage, damage by root pathogenic fungi may become quite high. From root lesions a number of - usually quite common - fungi was isolated, and their pathogenicity tested under greenhouse conditions. Experimental evidence from former authors and field observations led to the opinion of strong mutual dependence and mutual influence of wheat attack by different wheat pathogenic fungi. In model field experiments with artificial inoculation, this mutual influence was investigated for Erysiphe graminis, for Pseudocercosporella herpotrichoides and for Septoria nodorum. The results led to the conclusion that usually such influence should be of minor importance and of shorter duration only. - Statistical analysis of numerous assessment data from a number of field experiments with wheat variety mixtures in many cases revealed highly significant correlations between the attack by powdery mildew, leaf rust, stripe rust and/or S. nodorum (unspecific necrotic leaf spots), which support the aforementioned statement. Root attacking fungi were not included in this study
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