Ask a Question forum: Red Spots on plant

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victoriana
Dec 31, 2014 10:12 AM CST
Could you help me with this plant, it is huge and a focal point in the back yard
and has developed these horrible red spots. The red spots are killing the plant. please see attached photo.

Any ideas would be appreciated.

Thank you.
Victoria


Thumb of 2014-12-31/victoriana/fc4a65
Name: Elaine
South Sarasota, Florida (Zone 9b)
The one constant in life is change
Cat Lover Master Gardener: Florida Tropicals Multi-Region Gardener Vegetable Grower Region: Florida
Herbs Orchids Birds Garden Ideas: Level 2 Garden Sages Celebrating Gardening: 2015
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dyzzypyxxy
Dec 31, 2014 10:27 AM CST
Hi Victoria, welcome to ATP and hope we can help. Need more info, though!

A few more pictures, showing the whole plant and the surrounding area would help. It is in the sun or shade? Under a tree?

Do you know what kind of plant it is? From the picture it looks like it could be anything from a bromeliad to a yucca, agave or a ginger. If you have an older picture of when the plant was healthy that would be helpful, too.

Also what part of the world do you live in? Your climate conditions right now could be affecting the plant.
Elaine

"Success is stumbling from failure to failure with no loss of enthusiasm." –Winston Churchill
Name: Lin
Florida (Zone 9b)
Region: United States of America Morning Glories Region: Florida Houseplants Charter ATP Member I was one of the first 300 contributors to the plant database!
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plantladylin
Dec 31, 2014 12:12 PM CST
It looks like some sort of Scale insects, images can be seen here:
https://www.google.com/search?q=scale+insects&biw=1363&bih=7...

More information about scale insects and their control:

http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7408.html

https://www.rhs.org.uk/advice/profile?PID=455


~ Eat, Sleep .... Play in the dirt ~
Name: Lin
Florida (Zone 9b)
Region: United States of America Morning Glories Region: Florida Houseplants Charter ATP Member I was one of the first 300 contributors to the plant database!
Garden Procrastinator Birds Butterflies Bee Lover Hummingbirder Container Gardener
Image
plantladylin
Dec 31, 2014 12:15 PM CST
victoriana: I forgot to say Welcome! We're glad you found us here at All Things Plants!

Lin
~ Eat, Sleep .... Play in the dirt ~
Name: Elaine
South Sarasota, Florida (Zone 9b)
The one constant in life is change
Cat Lover Master Gardener: Florida Tropicals Multi-Region Gardener Vegetable Grower Region: Florida
Herbs Orchids Birds Garden Ideas: Level 2 Garden Sages Celebrating Gardening: 2015
Image
dyzzypyxxy
Dec 31, 2014 12:20 PM CST
Looking at your picture again, first thing I'd do is clean up - cut off all that dead foliage and put it in a plastic bag in the trash, don't compost it! That way if it is a fungal disease or insect infestation, you won't keep the bad stuff around.

After you do that, take the hose on a warm day and hose the whole plant off thoroughly. Then inspect it with a magnifying glass, especially looking in the leaf axils, and on the undersides of the healthy leaves. Insects especially like to feed on new tender growth, not the old dead stuff. But they use the dead foliage for hiding areas. You have what looks like a nice healthy new plant right on the bottom of that picture. Check it over carefully!
Elaine

"Success is stumbling from failure to failure with no loss of enthusiasm." –Winston Churchill
[Last edited by dyzzypyxxy - Dec 31, 2014 12:23 PM (+)]
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Name: Lin
Florida (Zone 9b)
Region: United States of America Morning Glories Region: Florida Houseplants Charter ATP Member I was one of the first 300 contributors to the plant database!
Garden Procrastinator Birds Butterflies Bee Lover Hummingbirder Container Gardener
Image
plantladylin
Dec 31, 2014 12:30 PM CST
I can't see jagged leaf edges in the photo but the plant does resemble Agave:

Century Plant (Agave americana subsp. americana)

Variegated Century Plant (Agave americana 'Marginata')
~ Eat, Sleep .... Play in the dirt ~
Name: Elaine
South Sarasota, Florida (Zone 9b)
The one constant in life is change
Cat Lover Master Gardener: Florida Tropicals Multi-Region Gardener Vegetable Grower Region: Florida
Herbs Orchids Birds Garden Ideas: Level 2 Garden Sages Celebrating Gardening: 2015
Image
dyzzypyxxy
Dec 31, 2014 12:33 PM CST
The little one right at the bottom of her picture has spines on the leaf edges, Lin. I'm thinking it's an Agave too.
Elaine

"Success is stumbling from failure to failure with no loss of enthusiasm." –Winston Churchill
Name: Lin
Florida (Zone 9b)
Region: United States of America Morning Glories Region: Florida Houseplants Charter ATP Member I was one of the first 300 contributors to the plant database!
Garden Procrastinator Birds Butterflies Bee Lover Hummingbirder Container Gardener
Image
plantladylin
Dec 31, 2014 2:09 PM CST
Aha, I didn't even notice that little pup. It does indeed look to be Agave. I found this information about insects and diseases of Agave, Aloe, Cactus and Yucca: http://extension.arizona.edu/sites/extension.arizona.edu/fil...
~ Eat, Sleep .... Play in the dirt ~

victoriana
Dec 31, 2014 4:55 PM CST
Hello,

Thank you for all the quick help. Please note I have uploaded two more images.

Kind Regards
Victoria
Thumb of 2014-12-31/victoriana/e43321
Thumb of 2014-12-31/victoriana/749584

Name: Elaine
South Sarasota, Florida (Zone 9b)
The one constant in life is change
Cat Lover Master Gardener: Florida Tropicals Multi-Region Gardener Vegetable Grower Region: Florida
Herbs Orchids Birds Garden Ideas: Level 2 Garden Sages Celebrating Gardening: 2015
Image
dyzzypyxxy
Jan 1, 2015 10:44 PM CST
Victoria, if you are in S. California, I'd be willing to bet your beautiful agave plant is suffering from the heavy rains you had recently followed by cold weather. IF that's the case, there's not much you can do but wait to see if it recovers. Agaves can take heat and dry a lot better than cold and wet.

Still, you do need to cut off all the dead leaves, and clean up around the base of the plant for it to dry out and begin recovery. Please post more pictures, close up, and full plant after you've cleared the dead stuff, so we can see if the red spots are on the healthy foliage as well. That could indicate a fungal infection that you could treat.

Also pot up that little pup, as a back up! Good drainage is essential for those plants, so use a coarse cactus mix for it.
Elaine

"Success is stumbling from failure to failure with no loss of enthusiasm." –Winston Churchill

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