Infected grafted Astro hybrid

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Mark k.D
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Infected grafted Astro hybrid

Post by Mark k.D » Sat Jan 13, 2018 9:41 am

To me this looks like cold. I have sprayed with a disease and bug killer about a month back. I welcome any suggestions?
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rodsmith
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Re: Infected grafted Astro hybrid

Post by rodsmith » Sat Jan 13, 2018 10:02 am

The plant looks severely shrunken and discoloured. It may well be dead.
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Growing a mixed collection of cacti & other succulents; mainly smaller species with a current emphasis on lithops & conophytum.
Mal L
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Re: Infected grafted Astro hybrid

Post by Mal L » Sat Jan 13, 2018 10:53 am

Sadly I would have to say that if it was mine I would dispose of it a.s.a.p., just in case it has something transmissible. Even if it is just cold marking, being an Astrophytum it will take a very long time for new growth to predominate (it's also not likely to naturally offset), and it will always retain a manky-looking bottom part - that is if it actually survives! If you can be sure it is just cold marking, and it stays alive - and if you don't want to give up on a possibly rare-ish and expensive cultivar (?) - then it might be possible to cut the top off and try to force offsetting, and start again. I say "might" because I have no personal experience of doing this with an Astrophytum - maybe someone here can comment on actually having done so?
Malcolm
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RAYWOODBRIDGE
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Re: Infected grafted Astro hybrid

Post by RAYWOODBRIDGE » Sat Jan 13, 2018 1:33 pm

This cultivar does not look its best in myriostigma form. ( always best in ornatum or asterias forms ) Your plant does not look that bad for mid winter in a cold greenhouse, but my worry would be, what is it grafted on, because myriostigma can take -5 or -6c no problem, but the stock most likely cannot take any frost.
I keep grafted plants in an area to please the stock plant,if you do warm this plant up make sure you do it very slowly 1 or 2c at a time otherwise everything could turn to mush.
Best of luck, always best to keep a plant and see how it goes,even if you keep it in isolation, you learn more that way than throwing it away.
Ray

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Cactus only collection mainly from seed, Echinocereus incl.Wilcoxia and Peniocereus.
Echinocactus,Astrophytum,Ferocactus,Stenocactus,Thelocactus,Opuntia,Cleistocactus,Oreocereus, Lophophora & Ariocarpus. Also Rhipsalis, Lepisium and Disocactus
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Tina
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Re: Infected grafted Astro hybrid

Post by Tina » Mon Jan 15, 2018 6:37 pm

Looks like it may be a hylocereis graft, if it is it needs heat. With grafted plants I tend to give a light watering in winter.
Tina

varied collection of succulents and cacti but I especially like Euphorbia's and variegated agaves.

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RICHAUD
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Re: Infected grafted Astro hybrid

Post by RICHAUD » Sat Jan 20, 2018 7:31 am

too much moisture with low temperatures causes these yellow spots which are unfortunately definitive (they will be white after)
treatment with Bordeaux mixture and look at the surrounding plants
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