Ask a Question forum→Please help my monstera, the spots are growing and i don't know what it is

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Germany
viti2106
May 26, 2020 1:43 PM CST
So I noticed spots developing on my baby monstera on the lowest two leaves 4 days ago and so far I still dont know what is it but the spots are growing! Also, I dont know if one can tell from the photos, but the leaves on the side where the spots are are becoming more and more yellow. Also... there is a brown spot on the stem where the lowest leaf is attached. I dont overwater it (or so I think) - I water when the top 3-4 cm are dry so about once every 10 days. What is this? Should I remove the leaves? Treat it with something? Please help! Thank you! I got the plant roughly 2 weeks ago and the seller is not replying...

P.S. Ive tried fungicide, ive tried neem oil but the spots seem to be spreading.


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Name: Gina
Florida (Zone 9a)
Tropical plant collector 35 years
Region: Florida Tropicals Aroids
Image
Gina1960
May 26, 2020 3:10 PM CST
Its a lack of humidity
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Germany
viti2106
May 27, 2020 3:29 AM CST
Gina1960 said:Its a lack of humidity


I raised his humidty to 70% (he is in the bathroom where I can just turn on hot water and make the room steamy) but it just continues spreading. The tent that I ordered hasnt arrived yet Sad
Name: Will Creed
NYC
Prof. plant consultant & educator
Image
WillC
May 27, 2020 8:21 AM CST
It doesn't require increased humidity as long as it is watered properly. I suspect you are letting it get dry too deep into the pot. Please post a photo that shows the entire plant and its pot.

How far is it from the nearest window?
Will Creed
Horticultural Help, NYC
www.HorticulturalHelp.com
Contact me directly at [email protected]
I now have a book available on indoor plant care
Name: Gina
Florida (Zone 9a)
Tropical plant collector 35 years
Region: Florida Tropicals Aroids
Image
Gina1960
May 27, 2020 9:53 AM CST
Actually the most common cause of this type of spotting in Monstera, anthurium and Philodendron is lack of adequate humidity and lack of proper nutrients
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Germany
viti2106
May 28, 2020 12:00 PM CST
WillC said:It doesn't require increased humidity as long as it is watered properly. I suspect you are letting it get dry too deep into the pot. Please post a photo that shows the entire plant and its pot.

How far is it from the nearest window?


There is the whole plant, including the pot and the progress of the spots as of today:

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He is in quarantine in the bathroom for the time being until I figure out what is wrong with him and that he is not dangerous to my other plants. He is currently about 2m away from a ceiling window (no direct sun is hitting him like ever) and Ive turned on a growth lamp for him as his newest leaf turned out to be smaller than expected. Humidity level is now at about 60-70%, in the night though it drops to 50% as I am sleeping and not checking up on it.
Germany
viti2106
May 28, 2020 12:05 PM CST
Gina1960 said:Actually the most common cause of this type of spotting in Monstera, anthurium and Philodendron is lack of adequate humidity and lack of proper nutrients


The tent still hasnt arrived so if it doesnt come tomorrow, I will build up something for him myself from wood sticks and a transparent huge bag and will keep then the humidity stable Smiling I did spray him two weeks ago with a seaweed spray and gave him a super tiny zip of fertiliser for green plants a couple of days ago to exclude nutritional deficiency but so far, no improvement whatsoever. Sad The thai monstera, however, doesnt seem to mind at all her lower humidity level of about 40-50% but then again I have no experience with those plants but I thought that they would be somewhat similiar. I had to take her out of the bathroom as I wasnt sure if this plant is dangerous for the thai one. Im running out of quarantine spots... Grumbling

Name: Gina
Florida (Zone 9a)
Tropical plant collector 35 years
Region: Florida Tropicals Aroids
Image
Gina1960
May 28, 2020 12:44 PM CST
You need to feed aroids in particular with a fertilizer that has all the micro and trace nutrients, especially Boron and Manganese. Does your seaweed spray have that?
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Germany
viti2106
May 29, 2020 2:20 AM CST
Gina1960 said:You need to feed aroids in particular with a fertilizer that has all the micro and trace nutrients, especially Boron and Manganese. Does your seaweed spray have that?


No, it has a bunch of other stuff but Boron and Manganese are not inside. I got the seaweed spray as I read that it is good for the leaf of plants? However, I have a fertiliser that has Boron and Manganese inside. Should I give the plant a tiny sip? The spots are growing, its like they grow the most during the night when there is no light around :/

Oh and I just noticed that part of one of the air roots that was going into the ground has just vanished. Like there is a shell of a root but nothing inside in that spot and I grabbed the root to squeeze if its mushy and some subtance came out? Not bad bad smelling but somehow mildly fishy smelling. I dont know how to describe it. Should I cut that root?
[Last edited by viti2106 - May 29, 2020 2:24 AM (+)]
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Name: Gina
Florida (Zone 9a)
Tropical plant collector 35 years
Region: Florida Tropicals Aroids
Image
Gina1960
May 29, 2020 6:09 AM CST
I would. Something about your culture is off but I cannot tell you what it is. How much light is your plant getting? Can you put it into some really really bright light? The white portions on any variegated plant do not photosynthesize, so variegated plants often need more light than those that are not. Your plant is highly variegated, and the white portions will often deteriorate. But I don;t understand why you would be suffering root loss, if you are not drowning your plant
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Name: Will Creed
NYC
Prof. plant consultant & educator
Image
WillC
May 29, 2020 9:12 AM CST
The leaf spotting is not a serious problem, at least not yet. It is hard to keep this plant completely spot-free unless watering is near-perfect. There is no evidence of any pests or diseases so I don't think quarantining is necessary. Giving it proper light is much more important than quarantining.

It looks like your plant is potted in a fabric planter. Did it come that way or was that your choice?
Will Creed
Horticultural Help, NYC
www.HorticulturalHelp.com
Contact me directly at [email protected]
I now have a book available on indoor plant care
Name: Gina
Florida (Zone 9a)
Tropical plant collector 35 years
Region: Florida Tropicals Aroids
Image
Gina1960
May 29, 2020 11:36 AM CST
Another thing you might try is the addition of a Dolomite top dressing to your soil. A little goes a long way. Most serious aroid growers mix Dolomite into heir potting substrate before they pot plants.
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