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Invisibleverbage
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Yellow/Orange Spot on Cactus Seedling Tip
    #19304930 - 12/20/13 08:10 PM (10 years, 1 month ago)

Does anyone know what this yellow spot is?  I had a friend look after these seedlings while I was out of town for a week.  I can't tell if they were over watered but I'm nervous that these will die and more will follow.  I currently have the pans drying out with humidity domes off and a fan blowing across. 

I have placed a red square around the seedlings with yellow/orange on the tip.  There are several seedlings going this orange/yellow but I only took pictures of two. These seedlings are a little over a month in age.  Thanks!





Edit: The orange is more pronounced in person.  The camera doesn't do it justice. 


Edited by verbage (12/20/13 08:12 PM)


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Invisiblekarode13Facebook
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Re: Yellow/Orange Spot on Cactus Seedling Tip [Re: verbage]
    #19309056 - 12/21/13 06:36 PM (10 years, 1 month ago)

Maybe they were watered while the sun was out, the water droplets may of magnified the sun and cauterized those tips.?

I've had similar things happen, the plants are usually fine if it's not a rot. They will offset and grow new columns in time.


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InvisibleSuperD
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Re: Yellow/Orange Spot on Cactus Seedling Tip [Re: verbage]
    #19309403 - 12/21/13 08:20 PM (10 years, 1 month ago)

I agree with karode's assessment.  I've seen this happen with my own seedlings, where a tiny drop of water will nest itself on the tip of the seedling and fry the top via magnification of the sun.  In all the cases where this has happened to me, the seedling will sprout a new pup and begin growing as if nothing happened.  So it isn't a total loss at all.  Just be a little patient and you should get new growth if the tip was damaged enough to cause it to pup. :thumbup:


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Invisibleverbage
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Re: Yellow/Orange Spot on Cactus Seedling Tip [Re: SuperD]
    #19309619 - 12/21/13 09:32 PM (10 years, 1 month ago)

Thanks karode and superD!!  After watering today I saw a droplet of water on the tips of the photographed cacti.  A pupping seedling will look kray.  Sounds great!


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Invisibleverbage
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Re: Yellow/Orange Spot on Cactus Seedling Tip [Re: verbage]
    #19347625 - 12/30/13 05:53 PM (10 years, 1 month ago)

Anyone mind revisiting this with me?  I'm debating on pulling these seedlings out and tossing them.  There are a few others seedlings with these spots that I haven't pictured.  The problem is, I cannot tell if it's spreading.  I've transplanted them and have bottom watered for the last week.

Posting new Pics for your perusal.  Most of the ones with tip problems are in the same pot.  Should I yank them or ride it out?

Thanks!

Orange spot seedling #1


Orange spot seedling #2


Black/white spot first photo seedling #3


Black/white spot second photo seedling #3


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Invisiblekarode13Facebook
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Re: Yellow/Orange Spot on Cactus Seedling Tip [Re: verbage]
    #19347643 - 12/30/13 05:56 PM (10 years, 1 month ago)

I'd let them ride it out and only pull them if they go soggy. If things don't stabilise and they seem to be getting worse then yank them. Just so whatever it is wont spread to others.

Some look a little too 'red' and may be in too strong of light. They might benefit from some shade, new green growth will let you know they're happy.


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Invisibleferrel_human
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Re: Yellow/Orange Spot on Cactus Seedling Tip [Re: karode13]
    #19347697 - 12/30/13 06:10 PM (10 years, 1 month ago)

It is affecting that one for sure but some will succumb to death. I have learned to accept death among seedlings. Its just a part of what growing from seed is. It happens but like the K-man said ride it out. You gotta bunch more to work with.

What kind of seedlings are they?


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Nature is my church and walking through it is gospel. It tells no lies and reveals all to those who look, and listen, closely.
-Karode


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Invisibleverbage
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Re: Yellow/Orange Spot on Cactus Seedling Tip [Re: ferrel_human]
    #19347747 - 12/30/13 06:21 PM (10 years, 1 month ago)

Hey thanks for reminding me Ferrel I deff meant to add it in the update post.  Every single seedling with troubled tips is a Bridgesii.  Good call on that info.

Karode, I think you're right and I'll ride it out.  You're likely also correct on the lighting.


Edited by verbage (12/30/13 06:26 PM)


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Invisibleferrel_human
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Re: Yellow/Orange Spot on Cactus Seedling Tip [Re: verbage]
    #19347842 - 12/30/13 06:39 PM (10 years, 1 month ago)

T. bridgesii. Explains it all. These are some very picky trich. I have problems with full grown plants now imagine growing seedlings. Well just take it one day at a time. The seedling phase, IME, isa very sketchy phase. You either got it right or you dont. No in betweens. But despite that one they look pretty damn good.

KeEp it up and update man.


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Nature is my church and walking through it is gospel. It tells no lies and reveals all to those who look, and listen, closely.
-Karode


Looking for Mimosa tenuiflora seeds. Buttons for trade


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OfflineYrat
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Re: Yellow/Orange Spot on Cactus Seedling Tip [Re: verbage]
    #19347908 - 12/30/13 06:51 PM (10 years, 1 month ago)

your lighting is definitely too strong.  the change to a more red/purple color in the second pic is a dead giveaway.  the "orange spots" are simply the cacti that have been burned a bit more than the others.  move them further away from the light source.  most cacti seedlings don't want intense light at such a young age.


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"There are a thousand hacking at the branches of evil
to one who is striking at the root."
-Henry David Thoreau
Strike The Root


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Invisibleverbage
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Re: Yellow/Orange Spot on Cactus Seedling Tip [Re: Yrat]
    #19348350 - 12/30/13 08:17 PM (10 years, 1 month ago)

On everyone's advice I've moved these to the perimeter of my grow shelves.  Their lighting is now dramatically reduced.  It's interesting because these Bridgesii's are the only seedlings complaining.  I just chalked the red/pink color change up to Bridgesii genetics.  I say that because I've read several times that this species is red as seedlings. 

For example, I have tons of younger cacti of various Trichs under the same lights.  They're all doing great and dollar bill green. The only ones changing color are some of my Bridgesii and a handful of my Boliviensis.

Sort of off topic but my understanding is the Boliviensis and the Bridgesii's are the same.  However... as a seedling the Boliviensis is more compact like a Macrogonus/Peruvianus. The Bridgesii's on the other hand are leggy and taller. I'm unsure if others have grown Boliviensis from seed but it's just something I noticed. 

Thank you everyone for the input!


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