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Q.What’s The Growth On My Night-blooming Cactus?

Zone New Orleans, LA | Brittanytoon added on October 10, 2022 | Answered

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!

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BushDoctor
Certified GKH Gardening Expert
Answered on October 11, 2022

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.

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

https://www.gardeningknowhow.com/garden-how-to/info/what-is-copper-fungicide.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/side-dressing-with-sulfur.htm

https://www.gardeningknowhow.com/ornamental/cacti-succulents/night-blooming-cereus

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