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Feb 25, 2012 9:48 AM CST

Plumerias Photo Contest Winner: 2015 Charter ATP Member I was one of the first 300 contributors to the plant database! Garden Ideas: Master Level Forum moderator
Region: Florida Cat Lover Garden Sages Cactus and Succulents Tropicals Hosted a Not-A-Raffle-Raffle
I have never seen this before. A month ago I bought this as a stunning, very healthy looking plant. Now it is getting these gray spots. Is it a fungus? Can I do anything about it?
This is Agave 'Joe Hoak' and dear to my heart.


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Feb 25, 2012 11:15 AM CST
Name: Michele Roth
N.E. Indiana - Zone 5b and Fl
I'm always on my way out the door..
I was one of the first 300 contributors to the plant database! Forum moderator Garden Sages Garden Ideas: Master Level Dog Lover Cottage Gardener
Native Plants and Wildflowers Plant Identifier Organic Gardener Keeps Horses Hummingbirder Hosted a Not-A-Raffle-Raffle
I'm not experienced with these plants, Hetty, but my guess would be a blight or other fungal disease. I noticed that there are water droplets on the leaves...is there any way to help the leaves stay drier to retard the spread?

I don't use fungicides, so I can't help with types or applications to use, sorry.

If it were my plant, I'd probably quarantine it, if possible, and then cut away the infected leaves, dipping shears or knife in a disinfecting (10% bleach and water) solution after each cut and discard in the household trash. Then attempt to keep the leaves as dry as possible, while allowing the plant to have as much direct sun as can be had.

Hopefully, someone with more experience will chime in soon, but I wouldn't wait too long to contain it, especially if you have others of this type of plant.

Have you noticed any bugs present?
Cottage Gardening

Newest Interest: Rock Gardens


Avatar for Dutchlady1
Feb 25, 2012 11:31 AM CST

Plumerias Photo Contest Winner: 2015 Charter ATP Member I was one of the first 300 contributors to the plant database! Garden Ideas: Master Level Forum moderator
Region: Florida Cat Lover Garden Sages Cactus and Succulents Tropicals Hosted a Not-A-Raffle-Raffle
Thanks. No bugs, no.
Avatar for GardenGuyAZ
Feb 25, 2012 11:47 AM CST
Name: Alan
Chandler, AZ; 85225 (Zone 9b)
Sunset Zone 13
Birds Lover of wildlife (Black bear badge) Plant and/or Seed Trader Region: Southwest Gardening Plumerias Organic Gardener
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My guess is either sun burn or over-watering. I had an Americana that got sunburnt like that,
Avatar for GardenGuyAZ
Feb 25, 2012 11:57 AM CST
Name: Alan
Chandler, AZ; 85225 (Zone 9b)
Sunset Zone 13
Birds Lover of wildlife (Black bear badge) Plant and/or Seed Trader Region: Southwest Gardening Plumerias Organic Gardener
Native Plants and Wildflowers Xeriscape Butterflies Bulbs Charter ATP Member Container Gardener
See the gray/black spots forming on this sunburnt agave. And yours being variegated like it is, is probably going to be much more susceptible to full sun.

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Last edited by GardenGuyAZ Feb 25, 2012 12:12 PM Icon for preview
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Feb 25, 2012 12:44 PM CST
Name: Carole
Clarksville, TN (Zone 6b)
Charter ATP Member Garden Sages Plant Identifier I was one of the first 300 contributors to the plant database! I helped plan and beta test the plant database. Avid Green Pages Reviewer
I helped beta test the Garden Planting Calendar Garden Ideas: Master Level Cat Lover Birds Region: Tennessee Echinacea
Over-watering will do that as well. I was told the cells cannot uptake the water fast enough and it causes the cells to burst and make those spots. I have an agave that looks similar but when I put it where it doesn't get as much water, the new growth is all fine.
I garden for the pollinators.
Last edited by SongofJoy Feb 25, 2012 4:21 PM Icon for preview
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Feb 25, 2012 12:49 PM CST
Name: Carole
Clarksville, TN (Zone 6b)
Charter ATP Member Garden Sages Plant Identifier I was one of the first 300 contributors to the plant database! I helped plan and beta test the plant database. Avid Green Pages Reviewer
I helped beta test the Garden Planting Calendar Garden Ideas: Master Level Cat Lover Birds Region: Tennessee Echinacea
I'm not saying that's what's wrong with your plant, Hetty. It could be a fungal disease or ? ... many things look similar. Just reporting on the situation with my agave and what "cured" it.
I garden for the pollinators.
Avatar for Dutchlady1
Feb 25, 2012 4:10 PM CST

Plumerias Photo Contest Winner: 2015 Charter ATP Member I was one of the first 300 contributors to the plant database! Garden Ideas: Master Level Forum moderator
Region: Florida Cat Lover Garden Sages Cactus and Succulents Tropicals Hosted a Not-A-Raffle-Raffle
I will stop watering it. I checked with the grower and they told me it had been in full sun, so I know it is not sunburn.
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Feb 25, 2012 4:28 PM CST
Name: Carole
Clarksville, TN (Zone 6b)
Charter ATP Member Garden Sages Plant Identifier I was one of the first 300 contributors to the plant database! I helped plan and beta test the plant database. Avid Green Pages Reviewer
I helped beta test the Garden Planting Calendar Garden Ideas: Master Level Cat Lover Birds Region: Tennessee Echinacea
Frost damage is another possibility, maybe.
I garden for the pollinators.
Avatar for Dutchlady1
Feb 25, 2012 4:54 PM CST

Plumerias Photo Contest Winner: 2015 Charter ATP Member I was one of the first 300 contributors to the plant database! Garden Ideas: Master Level Forum moderator
Region: Florida Cat Lover Garden Sages Cactus and Succulents Tropicals Hosted a Not-A-Raffle-Raffle
We have not had any.
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Feb 25, 2012 5:00 PM CST
Name: Carole
Clarksville, TN (Zone 6b)
Charter ATP Member Garden Sages Plant Identifier I was one of the first 300 contributors to the plant database! I helped plan and beta test the plant database. Avid Green Pages Reviewer
I helped beta test the Garden Planting Calendar Garden Ideas: Master Level Cat Lover Birds Region: Tennessee Echinacea
That probably rules that out then. Looking more and more like the too wet thing. Or?
I garden for the pollinators.
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Mar 6, 2012 11:35 AM CST
Name: 'CareBear'

Amaryllis Cactus and Succulents Dog Lover Hostas Irises Region: Pennsylvania
Sempervivums
Hetty,
I'm with Al on this one. Looks like a burn. To be safe, keep it away from all the other collection. See what develops. I would not cut out the damage, you may make more in the process. Also I would maybe keep a tent or umbrella over it during the hottest parts of the day. Water plus heat is ok. It's those cold spells with water that rot sets in. Also remember a little cinnamon sprinkled over it to keep the rot/fungus in hand. I am no expert, it is only my best guess. Keep us informed on this. I would like to know what comes of this. I too love this agave. Good luck.
Stush
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