Cactus Looks Bad

Question

I live in Florida for 4 years now. Have had my Monstrous Cactus outside. I was away for a couple of months and when came home the cactus had all this sandy colored stuff all over it and I dont know what to do. I have had this plant for 40 years

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Answer 1

It could be cactus scab. Did someone water while you were away? Check its cultivation routine. This article should help:

https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/cactus-scab-treatment.htm