Orchid Care : Diseases – Crown Rot

Orchids are susceptible to various types of rot including leaf rot, root rot and crown rot. Monopodial orchids (Phalaenopsis and Vandas) are most suseptible to crown rot—a fungal infection that is caused by water pooling in the center (or crown) of the plant.
Crown rot can cause immense damage to an orchid and must be treated immediately. One solution is to use hydrogen peroxide (3%). You can treat the crown rot with full strength hydrogen peroxide, repeating every 2-3 days until the rot no 
Of course, prevention is the best medicine, even when it comes to orchids. Crown rot is 100% preventable. Water your orchids early in the day, so that the plant has time to dry off before night time and provide your plants with proper air circulation. Most importantly, always take the time to inspect the crown of your orchids regularly. Take a tissue and soak up any water that has pooled in the crown.
(If you do decide to remove severely damaged orchid leaves, make sure you sterilize the blade for each cut.)
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Warmest wishes from sunny Florida,