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Author Topic: Yellowing mature leaves  (Read 553 times)

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Offline StevenU

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Yellowing mature leaves
« on: July 07, 2017, 00:23:10 »
I've been growing Clivia now for over 15 years and about 4 years ago a few mature leaves on a otherwise healthy plant would turn yellow in strips and other areas and only affecting less than 1/4 of the leaf.  After months and months the leaf would finally die.  These diseased leaves are not the bottom ones so are not getting old and yellowing naturally.  After 4 years of this the plant was almost dead.  Now I see it beginning on two more Clivia and I don't want to lose my old orange grandmamma and it's yellow grandchild.  Has any one experienced this and can put a name on it or treatment?  I put my Clivia outside here in the summer and I do have botrytis on my peonies, but have no idea how botrytis exhibits on Clivia. 

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Online Frits Korting

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Re: Yellowing mature leaves
« Reply #1 on: July 07, 2017, 08:38:54 »
Hi Steven.
It looks like a fungus to me. Which part of the world are you and what treatments have you tried?
Regards Frits

Offline StevenU

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Re: Yellowing mature leaves
« Reply #2 on: July 07, 2017, 22:49:45 »
I'm in Minnesota.  Just bought the fungicide Daconil for the peonies.  I'll probably try that first if it's a fungus. 

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Online Mary Wise

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Re: Yellowing mature leaves
« Reply #3 on: July 09, 2017, 02:47:11 »
Stephen I would try giving them a spray with Copper Oxychloride
South West of Western Australia

Online Lionel Bester

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Re: Yellowing mature leaves
« Reply #4 on: July 09, 2017, 08:44:24 »
Hello Steven ,
                   It would be good to make sure that that rot has not extended into the " Psuedo stem " .....at the base of the leaves .
I would cut away that rot on the leaf and sterilize the cut ASAP , then  check the Psuedo Stem for rot by squeezing the base of the stem ... If it is hard it should be fine but check carefully regularly and monitor .
Be sure to sterilize any wound made from cutting away rotten areas .

If the stem is soft , you will need to cut all of the leaves off asap and keep cutting until no rot is seen from the cut top of the stem .

Please keep us updated on progress .
Regards,
            Lionel.

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