Q.What’s The Growth On My Night-blooming Cactus?
My night-blooming cactus has been developing thick brown scab-like growths on new leaves for about a year. Once they appear, they tend to spread quickly and look like they kill the leaves. I repotted a few months ago and the new growth looking great! No signs of black growth, however now it seems to be returning. I was spraying with Neem oil weekly and not noticing effect. Any advice would be so helpful!
Certified GKH Gardening Expert
This is bacterial. Make sure that this is planted in a cactus mix, and neglected, as far as watering goes. They do not do well in moist soils.
From here, you will need a strong fungicide. I would contact your local agricultural extension service to make sure of which one's are OK to use in your area. Wettable sulfur is a good one for general use, and is usually safe for any people around. It makes for a decent bactericide. sulfur is, generally, lacking from the soil anyway.