HOW TO CURE WHITE SPOTS ON PENCIL CACTUS

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.

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1 Comment To "HOW TO CURE WHITE SPOTS ON PENCIL CACTUS"

#1 Comment By GKH_Susan On 11/06/2020 @ 12:56 pm

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 ^[1]
https://www.gardeningknowhow.com/ornamental/cacti-succulents/pencil-cactus/care-pencil-cactus.htm ^[2]

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[1] https://www.gardeningknowhow.com/houseplants/hpgen/powdery-mildew-treatment.htm: https://www.gardeningknowhow.com/houseplants/hpgen/powdery-mildew-treatment.htm

[2] https://www.gardeningknowhow.com/ornamental/cacti-succulents/pencil-cactus/care-pencil-cactus.htm: https://www.gardeningknowhow.com/ornamental/cacti-succulents/pencil-cactus/care-pencil-cactus.htm

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