On-line Guide to the positive identification of Members of the Cactus Family
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Oh yeah! It does look like mildew. Any way to clean it off or just let it dry out?Tom in Tucson wrote: ↑Sun Jul 10, 2022 7:56 pm If it's mildew you should find a new atmosphere to grow it with less humidity
Actually, that's called "sooty mold", and it's a problem when we're growing some Opuntioid species in a humid environment. Good news is that sooty mold is a bit unsightly, but by no means life-threatening. The humidity in my part of L.A. is on the high side, and whenever I see sooty mold on the extrafloral nectaries produced by my Tephrocactus inermis, I just let it dry out.
Oh great! Thanks for the infoSteve Johnson wrote: ↑Sun Jul 10, 2022 9:49 pmActually, that's called "sooty mold", and it's a problem when we're growing some Opuntioid species in a humid environment. Good news is that sooty mold is a bit unsightly, but by no means life-threatening. The humidity in my part of L.A. is on the high side, and whenever I see sooty mold on the extrafloral nectaries produced by my Tephrocactus inermis, I just let it dry out.
I am in LA as well and close to the ocean. Reading your post I suspect this guy of mine has same issue so I am going to make sure it gets nice and dry.Steve Johnson wrote: ↑Sun Jul 10, 2022 9:49 pmActually, that's called "sooty mold", and it's a problem when we're growing some Opuntioid species in a humid environment. Good news is that sooty mold is a bit unsightly, but by no means life-threatening. The humidity in my part of L.A. is on the high side, and whenever I see sooty mold on the extrafloral nectaries produced by my Tephrocactus inermis, I just let it dry out.