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 Post subject: ID this plant affliction
PostPosted: Fri May 08, 2009 1:20 pm 
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Location: South Carolina
I found this weird stuff on my Horridocactus. I first thought scale. Now, I'm not sure. I poured Imidacloprid on it yesterday. waht is is and how do I get rid of it?

Bill in SC


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PostPosted: Fri May 08, 2009 1:28 pm 
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It might be mites.

If it is mites, there is a 3-1 Bayer product which has antifungal, insect, and mite control chemicals. If it is scale, the hard waxy external covering may protect it from topical imidicloprid. Systemic application through the roots may be necessary.

Whatever it is, it certainly sucks. 8)


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PostPosted: Fri May 08, 2009 1:39 pm 
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Well, I drenched the whole plant, so it should suck the poison up through the roots.

BB in SC

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PostPosted: Wed May 26, 2010 4:36 pm 
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Hi Bill,

I have the same problem with one of my cacti.
Did Bayer 3 in 1 work for you? thx -J


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PostPosted: Wed May 26, 2010 7:01 pm 
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Bill,
I'm certain you have but for newer members, until the malady is ID'd
ISOLATE, ISOLATE, ISOLATE--oh yea and-------------------------ISOLATE!!!!!!!!!!!!!!! :(
Sorry your plant is ailing,
AZED

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PostPosted: Wed May 26, 2010 8:56 pm 
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I had a similar if not same ailment attack my plants a few years back. I had to STOP Watering and eventually it just stopped spreading. I don't think it is gone as every now and then, I see some new spots.

here some of my pics from a few years back.

Image

[img]http://i12.photobucket.com/albums/a206/paulzie32/Cactus/Mystery%20Ailment/PICT4307.jpg
[/img]

Image

Image

Image

Image

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PostPosted: Wed May 26, 2010 9:54 pm 
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paul,
With all respect I can't find the common thread between your plants afflictions and Bill's.
what do you see?
ed

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PostPosted: Thu May 27, 2010 10:18 am 
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My photos were taken early and the darker brown centers were not showing on my plants yet... but look around the edges of those brown spots on Bills. The last pic I posted is probably the most obvious if you look at the center of the growing yellowing mass. The centers get darker and eventually start to appear to dry out and the plant/pad turns almost black and dies.


It's not a black like the fungus black that turns the pad mushy, but instead it shrivels and dries out turning the cuticle flaky and can be blown off. This was an Opuntia compressa from a Pensacola beach (growing right on the beach!) that should certainly have been used to extra water and/or moisture. The columnar was a seedling grown from seeds collected in the Caribbean (the island of Mayreau). Again, a plant that should be accustomed to the more humid air here in Florida.

I don't know what the cause is but I took off any infected pads or cut out the infected areas on the Opuntia. On the other plants, (those that survived anyway), I just withheld any water for the rest of the year. I did lose a cereus and most of that opuntia, but it is now recovering this year.
It started really slowly. Infact, I thought it was just corking on the Cylindropuntia, but when it hit my small Opuntia it progressed quicker. So I guess some plants are more susceptible than others.

I also bought a Copper based fungicide and sprayed everything with it.... I have no idea how much of an affect that had as I was trying everthing and anything I could.

I never had it tested as by the time I found someplace interested (I believe it was Miami University), it stopped spreading. They also wanted me to send them one infected plant and one noninfected plant... but I only had one of some of them or just two remaining infected columnars... two had already succumed to it.

Now am just careful about how much water they get and keep my fingers crossed.

Oh yeah... as those waxy, yellowed sections grow, they eventually get thick enough and can be picked off with the fingernail like a scab. The flesh under it is still green like any other place you peel the cuticle off, but soon also turns black and the process continues as I described earlier.

The only plants I had that were affected were Opuntiads and Cereus. But I didn't have any Horridocactus. I did have Mamms, Echinocactus, Echinocereus and a few others and no problems with them.

All I can suggest Bill, is try what ever Fungicide you have and if you find something that definitvely works, Let me know in case it comes back over here.

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PostPosted: Thu May 27, 2010 1:15 pm 
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Yikes,
Sounds like a nightmare. EEEK!
AZED

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PostPosted: Thu May 27, 2010 1:52 pm 
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Location: UK
I see skin damage but no pets, so it could be almost anything. Maybe it is a parasitic mite like the Aloe mite?


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