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A white, powdery substance on the leaves of a Euphorbia plant is often a sign of powdery mildew, a fungal disease that affects many different plant species. Powdery mildew typically starts as small white spots on the leaves and then spreads, forming a white, powdery coating over the entire leaf surface. Powdery mildew is caused by a fungal spore that thrives in humid conditions. Overwatering, high humidity, and poor air circulation can all contribute to the growth and spread of powdery mildew. To treat powdery mildew on a Euphorbia plant, first, remove any affected leaves and dispose of them properly. Then, treat the plant with a fungicide according to the manufacturer's instructions. Additionally, make sure the plant is getting enough light and that the air circulation is good around the plant.
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