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IMMOVERT

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La rouille du rosier

Posted on December 27, 2010 at 10:40 AM
IMMOVERT - La rouille du rosierSignes de présence:
Des taches orange vif se développent sur la face supérieure des feuilles, et des pustules de spores de même couleur gagnent le revers. Les feuilles les plus touchées tombent prématurément. C'est en juin que les attaquent foliaires débutent et sont les plus virulentes. En août ou au début de septembre, des masses de spores brun foncé se forment sous les feuilles: ce sont les spores hivernantes, qui succèdent à celles de l'été. es feuilles tombent en nombre. La rouille survient rarement au printemps; elle ne sévit alors que sur les rosiers botaniques et se traduit par la production de grandes quantités de spores orange vif, éclatant au sein des tiges. Les tiges fissurées sont rapidement infectés par des agents pathogènes secondaires et se flétrissent.
 
Cause:
Le champignon Phragmidium, en particulier P.tuberculatum, moins souvent P.mucronatum. L'humidité est essentielle au développement et à l'extension de la maladie. Les spores se dispersent avec les courants d'air. Le champignon persiste au sein des tiges des plantes attaquées au printemps. Les spores hivernent également à la surface du sol et sur les déchets tombés au sol, sur les tiges, les clôtures ou les tuteurs.
 
Lutte mécanique:
Rabattez sans tardez les tiges attaquées au printemps, en veillant à n'épargner aucune tige infectée. Améliorez la circulation de l'air en taillant et en espaçant vos plantes.
 
Lutte naturelle:
Utilisez le purin de prêle ou la bouillie bordelaise contre la rouille.
Purin de prêle et bouillie bordelaise peuvent être mélangés; bien noter que dans tous les cas l'utilisation est préventive.
 
Lutte chimique:
Pulvérisez un fongicide à base de myclobutanil, propiconazole  ou triforine, souffre, cuivre.
Ils ont une action préventive et curative.
Ces produits sont agréés culture biologique ou sans classement toxicologique.
 
Nous commercialisons plusieurs traitements efficaces:
 
- un fongicide rosiers sous forme liquide à base de Propiconazole sans classement
toxicologique en bidon de 1 litre.
- une solution bordelaise sous forme liquide à base de cuivre sans classement toxicologique en bidon de 400 ml.
- un anti oïdium en poudre à base de souffre utilisable en culture biologique en pot de 750 ml.  
- un traitement total rosiers prêt à l'emploi en pulvérisateur de 750 ml à base de bifenthrine et de myclobutanil sans classement toxicologique pour lutter contre l'oïdium, la rouille, les taches noires, les pucerons, cochenilles, chenilles. A noter que la formulation est aussi adaptée aux traitements de vos plantes en pots sur vos terrasses, balcons et en intérieur.
 
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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