Cactus And Bugs
What could be eating my cactus, and what is the treatment?
Certified GKH Gardening Expert
Unfortunately, your photo did not come through.
It could be many, many different insects, rodents, fungal and bacterial infections, or other problems. Without seeing any signs of the culprit, it would be hard to know for certain.
Here are some articles that can help you protect your plant: https://www.gardeningknowhow.com/special/organic/what-are-organic-pesticides.htm