Phalaenopsis Yellow Leaves and Fungal Infections
Channel: Orchids for Dummies
Date: 2021-02-23

Phalaenopsis Care Tips | Treating Yellow Leaves and Fungal Infections
Yellow splotches on the leaves will usually be caused by a magnesium deficiency and is reversible. Some nutrients are mobile (like magnesium) and others are not (like calcium), so it will depend on which nutrient is lacking that will determine if the yellowing can be reversed or is permanent. Premature yellowing of lower leaves in an otherwise healthy plant is typically a nitrogen deficiency, so either the plant is not receiving enough fertilizer and/or the nitrogen content is too low, this is sometimes reversible. And one reason that was left off is stem rot (which is the opposite of crown rot, the infection begins at the base). Most of the time, by the time you realize a Phal has stem rot, it is too late, you'll be able to lift the crown off from one of the leaves. If little puddles of water sit on leaves for long periods of time, then the leaf will usually turn yellow, then brown and finally black. This is called an Orchid fungus infection.

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