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IMMOVERT

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La mosaïque du rosier

Posted on December 27, 2010 at 11:54 AM
IMMOVERT - La mosaïque du rosierSignes de présence:
Les symptômes sont surtout visibles sur les feuilles, qui pâlissent, se couvrent de taches ou de mosaïques jaunes. Les marques sont généralement assez discrètes et pas aussi prononcées que sur les autres plantes virosées. Le rosier peut toutefois afficher une certaine déformation et un léger rabougrissement. Ces symptômes sont souvent confondus avec ceux, bien plus répandus, d'une intoxication à l'herbicide.
 
Cause:
Divers types de virus, notamment le virus latent du ringspot du framboisier et celui de la mosaïque du rosier.
 
Moyens de lutte:
Il n'existe aucun traitement. Les nématodes du sol sont un des vecteurs de la maladie. Il faut arracher et détruire les plantes les plus touchées.
 
Réservez votre cours de jardin " rubrique Nous contacter " pour apprendre à reconnaître les parasites et appliquer le traitement correspondant.

Categories: Les maladies des rosiers

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227 Comments

Reply CLAIRE
5:50 PM on July 12, 2015 
J'ai acheté plusieurs rosiers au printemps. Tous poussaient très bien. Depuis une huitaine de jours, beaucoup de ces rosiers présentent des tâches jaune pâle. Recherche Internet: mosaïque du rosier. Aucun traitement.
J'aimerais profiter des quelques fleurs que mes rosiers voudront bien m'offrir cet été mais ai peur que le virus ne s'installe vraiment dans le sol. Dois-je les arracher maintenant? ou attendre l'automne?
Je vous remercie à l'avance de votre réponse.
Claire
Reply Richard JULLIEN
3:19 PM on July 21, 2015 
Bonjour,
avant de penser à l'arrachage de vos rosiers, 2 pistes sont à vérifier:

- L'arrosage de vos rosiers a pu être déficient durant cette période de fortes chaleurs, la conséquence est en premier lieu le jaunissement des feuilles.
Vos jeunes rosiers doivent rester en sol humide constamment pour passer la période chaude.
- La maladie de la tache noire très fréquente( voir article sur le blog )
En espérant avoir répondu à votre souci.
Cordialement
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