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May 21, 2013

Les araignées rouges sont de minuscules acariens à 8 pattes qui absorbent le contenu des cellules foliaires d'où l'aspect argenté des feuilles infectées.
La femelle pond de 2 à 10 oeufs par jours, plus ou moins selon si la température est inférieure à 15°C ou supérieure à 22 °C.

Un excès d'insecticides favorisent leur développement en faisant disparaître leurs ennemis naturels.

Les solutions de lutte biologique sont :

  1. Bien arroser le feuillage des plantes le soir par temps chaud
  2. Ramasser et brûler les feuilles atteintes
  3. Pulvériser du purin d’ortie dilué à 0.5L dans 10L d’eau tous les 15 jours sur les feuillages.


                    
 

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Visibility: Everyone
Posted: Tuesday May 21, 2013, 6:51 am
Tags: sant environnement emploi [add/edit tags]

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