Photo With Thumb and Questions

Dear Sirs,

This could be my third e-mail to you guys regarding strange cactus disease/bug/fungus (all of which were generously answered). Hopefully this isn’t becoming annoying. I do appreciate your time and check in to your blog frequently. Here’s the latest.

Two photos of a Myrtillocactus pup. This is the first trouble I’ve had with it. Seems to have some kind of big orange spot? Its not a “scar” like other spots that occur. Any suggestions, I’d hate to lose this one.

The second cactus I can’t ID. I do know it may have burnt a bit this summer (you can sort of tell from one photo to the other). It appears like this one maybe toast (the black spots appear to be brown-rot like, but I cant say for sure). I worry the winter is too far away before I can re-pot. Even so the problems appear to be high on the cactus.

Both cactus are in a greenhouse in Oregon, which we keep dry (and usually bug free believe it or not!?!!?). It doesn’t get cooler than 50 and we open it up during sunny days. This winter I have been limiting water to approximately monthly, or as they needed. I don’t think overwatering is an issue but who knows.

img_0976 img_0977

Any input is appreciated.

Happy to help when we can.

The Myrtillocactus looks like it has Rust, which is a fungus. We treat with neem oil. You can alternate with a teaspoon of baking soda and a quart of warm water, sprayed on.

The other cactus, probably an Echinopsis, may have the same disease, or another fungus, just further along. You can try to treat the same way, but the prognosis is not as good.

Please note: Where you are using smooth pebbles as a mulch, that is going to keep the plants wetter in the winter. We prefer a rough stone, like lava which dries out faster.

Good luck

  Cactus and Succulents
  Carnivorous Plants

May 2024

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