Picked this one up from Home Depot a month or two ago. Noticed some discoloration when I bought it but assumed it was some damage/scarring from transport, especially since there was some sap on the discolored areas. Noticed a week ago the spines in the area looked abnormal and decided to spray down the largest individual with 70% isopropyl and isolate.
If this is 100% powdery mildew I might just chop the big one and treat/isolate the pups. I'm not particularly attached and would rather keep pests in my collection down. If it looks manageable, I do have the arid environment needed to hopefully treat it, but if it's going to take months of isolation I'd rather reduce the risk of spreading.
by slizzard_lizard94612
3 Comments
I don’t see any powdery mildew, just normal euphorbia things. Maybe the start of some corking.
I can’t say if this is or not for certain, but I can confirm they can definitely get p.m. and I’ve kept a fan on my Euphorbias 24/7 ever since I had some. The fan probably would have cured it by itself, but I went nuclear with separate sulphur and copper based fungicides. Haven’t seen any more in the years since I started keeping the fans on.
Edit: I didn’t do any isolation. It started spreading before I noticed it, but between the fungicides and increased airflow, it stopped dead in its tracks. It’s a dense and moist situation in my planter area where the problem began, and I almost keep expecting it to return, but the fans seem to be the magic ingredient.
Best thing you can do is get it out of that awful Altman peat moss soil. Also it’s Euphorbia cereiformis. Give it as much (acclimated) sun as possible. I see no powdery mildew. Just some discoloration.