cymbidium leaf turning black

[oscar freak]

hope this is in the right section.i noticed a while back a black blotch on the new growth of one of my cymbidiums and next thing the whole leaf was black.what could be causing it and what happens next if the new growth is dying is the whole plant to follow suit?

[Suzanne17]

Black rot? See page 21: http://www.phelpsfarm.com/OrchidPestsandDiseases.pdf


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[oscar freak]

thanks,i hope thats not what it is.

[Suzanne17]

A picture would definitely help.


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[cbuchman]

Has it been warm? I have found that new growth in particular on Cyms can be adversely affected by high temperatures.

I have seen leaves burn and new growth just turn black overnight. If it is expected to very very warm here, I will bring my 1 Cym into the air conditioning. Of course this is not so applicable to the Chinese Cyms who like warmer temps. So needless to say I have one 1 Cym, a mini, and 4 Chinese Cyms.

[oscar freak]

its still winter here though its started warming up but i would not consider it warm yet.

[Cym Ladye]

Suzanne is probably right if the black is coming from the crown of the bulb. If the black 'Notch' is somewhere else, who knows without a photo.

If the whole leaf is black, remove it gently and all the other leaves from the young growth. I suspect you will see a black crown. If you are lucky, this may not have spread beyond the new growth. You can use a sterile razor blade and gently scrape off the black, being careful not to injure the base with a new growth bud. Then Then sprinkle powdered cinnamon on the remaining top of the growth only and leave it open to the air.

This generally occurs when water stands in the crown too long. Happens with phals too and is usually the death of them. In Cyms. it just means the loss of the new growth unless it has started from the base of the bulb and that is a whole different problem.