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Q.HOW TO CURE WHITE SPOTS ON PENCIL CACTUS

Zone Austin, Texas 78750 | Anonymous added on November 5, 2020 | Answered

I have a pencil cactus that is approximately 6 foot tall and I have over looked the white spots on the branches and trunk. When realized the white spots were not from taking cuttings I found an article that advised putting alcohol on the spots. I have been doing that for about two weeks. Last night the trunk was green and on the bottom of the trunk which I had been putting alcohol on was green (which had been white prior) Now the complete trunk is white. Am I slowly killing it or is this killing the infestation which must have been deep. Please advise me how to proceed. I really don’t want to lose it.

GKH_Susan

Certified GKH Gardening Expert

Answered on November 6, 2020

I think it looks more like powdery mildew than a pest. You can try Neem Oil, it should help in either case.

https://www.gardeningknowhow.com/houseplants/hpgen/powdery-mildew-treatment.htm
https://www.gardeningknowhow.com/ornamental/cacti-succulents/pencil-cactus/care-pencil-cactus.htm

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