Journal article

Publication year: 1995

Pages: 45-49

Journal: Vitis // Herausgegeben Im Auftrage der Bundesforschungsanstalt FÜr RebenzÜchtung Geilweilerhof

Volume number: 34

Issue number: 1

ISSN: 0042-7500

Publisher: Institut Fuer Rebenzuechtung Geilweilerhof der

Abstract: 

Leaf discs of grapevine varieties and species of various resistance to downy mildew were infected by Plasmopara viticola, fixed after 6, 24 and 48 h of incubation and coloured with optical brighteners or fuchsin acid solution. The different stages of infection were investigated qualitatively and quantitatively.

Zoospores of P. viticola settled at the stomata of leaves of resistant and susceptible cultivars. The first phenomenon of resistance occurs when the germination tube tries to enter the substomatal hole. In clones of Vitis riparia and V. rupestris germination tubes of the pathogen were frequently hindered to enter the substomatal hole. In V. riparia and the resistant variety Fr 946-60 P. viticolawas often already stopped before forming a primary haustorium. In the resistant varieties Fr 946-60, Fr 993-60, Castor and SV 5-276 the pathogen was stopped in many cases after the formation of the first haustorium. At this time degeneration of the parasitized host-cells could often be observed. In the resistant variety Pollux cell degenerations mostly occur after the formation of the secondary haustorium.

Harvard Citation style: DENZER, H., STAUDT, G. and SCHLOSSER, E. (1995) HOST SETTLEMENT OF PLASMOPARA-VITICOLA ON DIFFERENT SUSCEPTIBLE HOSTS, Vitis // Herausgegeben Im Auftrage der Bundesforschungsanstalt FÜr RebenzÜchtung Geilweilerhof, 34(1), pp. 45-49

APA Citation style: DENZER, H., STAUDT, G., & SCHLOSSER, E. (1995). HOST SETTLEMENT OF PLASMOPARA-VITICOLA ON DIFFERENT SUSCEPTIBLE HOSTS. Vitis // Herausgegeben Im Auftrage der Bundesforschungsanstalt FÜr RebenzÜchtung Geilweilerhof. 34(1), 45-49.