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Q.White dust on indoor cactus

Zone Chesapeake va | Elizfin added on October 1, 2017 | Answered

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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Certified GKH Gardening Expert
Answered on October 2, 2017

This is a fungal disease, most likely powdery mildew. This article should help

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