If nothing is done, the orchid will die as the main stem collapses from widespread rot. It will eventually turn brown, then progress to black.
ORCHID STEM HOW TO
How To Identify Stem Rot Or Collar Rot In Your OrchidĪs the rot spreads, this yellow discoloration will darken. When this happens, water can easily settle into the crevices between these leaves and the main stem, leading to stem rot. Either that or they may be resting on top of the potting media. In this case, the lower leaves may be partially buried in the potting media. Stem rot can also occur if the Phalaenopsis orchid is potted too low in the orchid pot. Overtime, the multitude of bacteria or fungus leads to rotting of the plant tissue. The stagnant water then becomes a breeding ground for pathogens. As a result of high humidity conditions or lack of air circulation, the water might not be able to evaporate in a timely fashion. Stem rot is caused by bacteria or fungal spores germinating in the water left between the orchid’s crevices and folds. Unfortunately, monopodial orchids, such as Phalaenopsis and Vandas, are susceptible to many types of orchid diseases due to the plants’ structure and shape. Stem rot, or collar rot, is a bacterial or fungal infection most often associated with monopodial orchids such as Phalaenopsis orchids. This is because the rot occurs around the “collar” of the orchid’s stem. Stem rot is sometimes referred to as collar rot. As I mentioned earlier, stem rot is a result of standing water left in the crevices between the orchid leaves and main stem.
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