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Brown spots on an Alocasia stem can be caused by overwatering, underwatering, sunburn, or fungal infections. To effectively treat them, adjust the watering schedule to ensure the plant is not getting too much or too little water, provide adequate sunlight without direct exposure, and treat any fungal infections with a fungicide recommended for houseplants.

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Q: What are the possible causes of brown spots on an Alocasia stem and how can they be effectively treated?
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