Re: Black spots on leaves

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Posted by Newt on February 01, 2003 at 17:14:00:

In Reply to: Black spots on leaves posted by Eric Dickson on January 31, 2003 at 12:08:14:

: I have a Yucca Cane plant that is indoors. I have had it about 1 yr. In the past few months I have noticed black spots on the leaves. These spots are becoming more and more. I was wondering what was wrong with it. I Think it may have something to do with the watering. I was watering it about every month or so but someone told me that it was not often enough. For the past month I have been watering it about every week. If it is watering to much, will it dry out and be okay or do I need to transplant it? Just reasure me that it won't die. If need be I can take picture of the spot and send them to you to see what I am talking about. Please someone help me. Thanks

Hi Eric,

First I would like to say that how often you water depends on a lot of things. If it's humid in the house it will require less water as well as being in a ceramic or plastic pot, if it's not rootbound (the size of the pot in relation to the size of the roots), if it's not in sun and just which plant it is.

Plants in clay pots that breathe will dry out more quickly as well as full sun or if it's rootbound. Also, a fern will need more water than a cactus, but I'm sure you already know that.

With all that said, the best way to tell is to stick your finger in, and if it's dry the first inch down, then it's time to water.

Your brown spots seem to have started before you started giving it more water, so I'm thinking you may have a fungal problem. Do the black spots rub off or are they a part of the leaf?

Take a look at this site and see if it will help you to diagnose the problem.

http://www.agnr.umd.edu/users/hgic/diagn/

Good luck,
Newt

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