Plant pathological aspects in wheat cultivar mixtures

As in barley, the principle of cultivar mixtures works with wheat as well, as 2 years field experiments have shown. Yield data and disease suppression in equal mixtures of three cultivars were superior to those of two- or four-cultivar mixtures. Convincing evidence for a delay in disease development...

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Bibliographic Details
Published in:Zeitschrift für Pflanzenkrankheiten und Pflanzenschutz (1970) 1988-10, Vol.95 (5)
Main Authors: Stuke, F. (Goettingen Univ. (Germany, F.R.). Inst. fuer Pflanzenpathologie und Pflanzenschutz), Fehrmann, H
Format: Article
Language:ger
Subjects:
ARREGLO DE CULTIVOS
Entwicklung
ERYSIPHE
Erysiphe graminis
Fungi
INFESTACION
INFESTATION
Kulturelle Bekaempfung
LUCHA INTEGRADA
LUTTE INTEGREE
MODE DE CULTURE
PUCCINIA
Puccinia recondita
Puccinia striiformis
Rasse
SEPTORIA
Septoria nodorum
Sorte
TRITICUM AESTIVUM
VARIEDADES
VARIETE
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Summary:As in barley, the principle of cultivar mixtures works with wheat as well, as 2 years field experiments have shown. Yield data and disease suppression in equal mixtures of three cultivars were superior to those of two- or four-cultivar mixtures. Convincing evidence for a delay in disease development by mixing cultivars was achieved for race-specialized pathogens only, such as powdery mildew (Erysiphe graminis), the suppression of which was observed to be up to 67 per cent and 50 per cent in spring and winter wheat, respectively. As compared to pure cultivars (check), differences in disease incidence in winter wheat were highest on the lower leaves. In spring wheat, considerable differences were found even on the flag leaves and the ears. With the rusts, only in case of leaf rust (Puccinia recondita), some delay in its development was observed. In case of non-specialized pathogens, no obvious disease suppression usually occurs in mixtures. Under controlled conditions, however, some positive effects were observed with Septoria nodorum. When mixing different cultivars, their specific resistance gene patterns with respect to specialized pathogens has to be considered. Basic knowledge about these patterns mainly for leaf and stripe rust, and for powdery mildew, is an indispensable requirement when growing cultivar mixtures. These aspects are discussed
ISSN:0340-8159