Having Trouble Identifying My Cactus! #446156 - Ask Extension

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Having Trouble Identifying My Cactus! #446156

Asked April 04, 2018, 12:24 AM EDT

Hello,It seems that i can't identify my cactus and recently i noticed a red shiney dot that wasn't there before on it so i want to know what's wrong with it. THANKS

Arapahoe County Outside United States

Expert Response

Thanks for your question. While I’m working on plant ID, please let me know the size of the black dot. Thanks,
Kristena LaMar Replied April 04, 2018, 12:46 AM EDT
i checked it again it's small like it was before but there's a yellowish color in it
The Question Asker Replied April 04, 2018, 8:24 AM EDT
Thanks for the additional photograph.  So, your cactus isn't just one cactus.  The top part is actually a different plant from the bottom, and when they are grafted like this, they're called a "moon cactus," and are described in this article.  Note that these plants do not live long, typically not more than 5 years, if that.

As to the spot, since I can't look closely enough (which would require a magnifying glass), the best I can do is to refer you to this article that discusses 'brown spots' on cacti.  The two I would narrow it down to are the armored scale and anthracnose.  You can try both the neem oil (anthracnose) and the imidacloprid (scale) to see if either works.  In the meantime, keep this plant away from other plants, lest the problem multiply.

I hope this is helpful.  Good luck! 
Kristena LaMar Replied April 04, 2018, 4:28 PM EDT

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