White dust on indoor cactus

Recently I noticed that my cactus has a white dust all over the older parts ( it has recently grown a bit) the dust brushes off easily What could cause this?

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1 Comment To "White dust on indoor cactus"

#1 Comment By DLarum On 10/02/2017 @ 8:52 am

This is a fungal disease, most likely powdery mildew. This article should help
https://www.gardeningknowhow.com/houseplants/hpgen/powdery-mildew-treatment.htm ^[1]

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