Tu as pris des photos ??

tu as été victime d'un serial killer ........que fait la police scientifique?

Recently (2009 - 2010), diseases are often observed in imported plants, especially in P. equestris, in which the base of the roots and leaves turn to black as if they were covered with soot. This symptom is shown in Fig. 4. After a few months, the stem with all of the leaves falls off the base, revealing a black rotted core. This disease does not show any outward symptoms during the early stage of infection; rather, most parts of the leaves are still green. As shown in Figure 4 (rightmost), the leaves stay green, and only the base, which is hidden by the potting medium, show progression of the disease. Therefore, by the time something changes, and the disease becomes apparent, it is too late to cure the plant. I lost dozens of imported Phalaenopsis species to this disease until l found an effective chemical to treat it. The plants infected by this disease were imported from the Philippines (Taiwan is the country of origin). This virulent disease may be caused by one of the fungi of Phytophthora or Pythium.

:( Je n'ai pas d'autres idées. Un coup de froid ou une combinaison de facteurs (froid + faible luminosité + etc... ) ?

Suis loin d'être un pro, mais je pencherais aussi sur le sur-arrosage, ils étaient dans quel type de substrat? car sur la photo, on dirait bien de la sphaigne.

Il aurait perdu les racines et aprés les feuilles mais pas les feuilles et aprés les racines comme l'a dit ccatalie.