pest mark or disease ?
19 years ago
I left the house for a long trip. When I came back, I saw some of my cacti bearing these brown markings
Left: Sclerocactus sp. This one has a dented marking, as if it was nibbled by some insect.
Right: Borzicactus Samaipatanus, has a protruding marking. I tried to scrape it off, but it won't come-out.
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