Good morning. I have two sets of pithaya. One set I am growing from seed, the other I bought at a nursery. Since about a month, boht sets have been getting little red bumps, like rust. The large, nursery grown cactus has it all over one of the sections, and I can see that part of it is starting to go bad. The second set is a collection of about 10 cacti, between 1/2 inch and four inches heigh. They have little rust bumps, and it seems more and more. One of the plants has had the rust go right through one of the flanges. I live in Paris, France, and the weather is cooling off. I have moved both sets inside and they are in a warm area, with about two to three hours of direct sunlight per day. I read that moisture and coolness might have been a problem. Another comment. I can push the rust off,like a scab, but it does not seem to be scale. Thank you for your assistance. Sincerely, Vladimir Paris, France PS: Please see the attached photos.
