Hydrangea virescence. I.- Description of the disease and its transmission to differential host plant Catharanthus Roseus by Cucusta Subinclusa

Cousin, M.T.; Sharma, A.K.; Rousseau, J.; Poitevin, J.P.; Savoure, A.

Hydrangea virescence. I.- Description of the disease and its transmission to differential host plant Catharanthus Roseus by Cucusta Subinclusa

1986

Cousin, M.T. | Sharma, A.K. | Rousseau, J. | Poitevin, J.P. | Savoure, A.

Les symptômes de la virescence de l’hortensia récemment apparue en France sont comparés à ceux décrits dans divers pays d’Europe et aux U.S.A. Leur période d’apparition et les risques de contamination sont décrits en tenant compte de la culture particulière de l’hortensia, caractérisée par deux stades très différents : la culture « en vert » et le « forçage ». La transmission à Catharanthus roseus par Cuscuta subinclusa montre que la souche observée en France diffère de celle décrite en Belgique et présente de grandes analogies avec les germes fins ou Aster Yellow du glaïeul.

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A virescence disease has recently been observed in France on Hydrangea macrophylla. This ornamental plant is cultivated in a rather particular way, comprising two successive phases : "production of mature plants" and "production of flowering plants". The possible period of disease inception and symptom appearance has been studied with respect of these two phases. Symptoms have been compared with those already described from different localities in Europe and America. Transmission of the pathogen to the differential host periwinkle (Catharanthus roseus) through dodder (Cuscuta subinclusa) revealed that the virescence observed in France was different from that in Belgium and had some similarities with the grassy shoot disease of Gladiolus.

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