Oedema Disease on Houseplants; Causes, Symptoms, Treatment and Prevention

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Oedema Disease Causes & Symptoms in Houseplants

Oedema Disease also called Corky Scab is characterized by hard, corky growths on the underside of leaves or stems. This corcky growths (scabs) is the plant's response to soggy soil coupled with low light intensity. These bumps cannot be removed without damaging the leaf.

In such conditions, the plant will rapidly absorb water from the soil but since the light available is too little, most of the water cannot be used up quickly. This results in the cells bursting. The hard corky spots are due to the bursting plant cells. The affected leaves will not heal, but the plant will not die from this disease because it is not contagious.

Treatment for Oedema Disease on Houseplants

1. Remove and discard the badly affected leaves to keep the plant neat and tidy, as they will not recover.


2. Move the plant to a brighter spot to promote a faster growth.


3. Reduce the frequency and amount of watering. Do not water on a schedule; water when the top few inches of soil dry out.

How to Prevent Oedema Disease in Houseplants

1. Use a pot that has a drainage hole and free-draining soil to prevent overwet soil conditions.


2. Always allow the top few inches of soil to dry slightly between waterings; do not water on a schedule to avoid waterlogging.


3. Position the plant in a warm, well-lit place to encourage a faster growth.


4. Maintain good air circulation for the plant to promote transpiration.

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