Dendrobium Cruetum leaves turning yellow with black spots - Orchid Board

csmcguire81 · #1 07-31-2011, 01:34 AM

Help!!! I got this Dendrobium about 2 weeks ago and recently a few leaves have started to develop black spots and the leaves turn yellow then fall off. This happens very quickly, in 1-2 days.

Can anyone tell me what is going on? I am new to this and have no idea what I am doing wrong.

I tried to upload photos but was unsuccessful.

RosieC · #2 07-31-2011, 06:52 AM

Pics would be helpful, there is a link in my signature section below for help with that.

I'm not good on diseases, but it could be some sort of fungus, although it could also be normal drop of leaves on a maturing cane. Several of my Dens drop all but the top leaves on each cane when the cane reaches full height.

csmcguire81 · #3 07-31-2011, 12:19 PM

RosieC, thank you for your help. I have followed the steps in the link a few times but it keeps telling me that I am missing a security key. Oh well, I broke down and opened a flicker account and have put the links below.

DSC01706 | Flickr - Photo Sharing!

DSC01703 | Flickr - Photo Sharing!

DSC01702 | Flickr - Photo Sharing!

pedidiva · #4 07-31-2011, 12:37 PM

I would cut off the yellow leaf. Does it feel squishy? Dust with Cinnamon. Rest of plant looks OK. Looks amost like something was "dripped" onto the leaf. Have the other leaves that have fallen off showed the similar circula pattern?

With my Den Cruetum, the laves have just turned yellow & fallen off (aging) w/o the black spots. You may want to isolate the plant & see what happens.

csmcguire81 · #5 07-31-2011, 12:49 PM

Pedidive- there has been a total of 4 leaves that have done this, 2 on each stock.

Gage · #6 07-31-2011, 01:20 PM

Mine looked similar, turned out to be viral. I tossed it.

Someone gave me a test to see if it had a virus, not sure where you buy these.

mmursuli · #7 07-31-2011, 01:39 PM

That does not look good. I'd put it in quarantine.

Ironwood · #8 07-31-2011, 02:41 PM

The plant looks a bit distressed to me like there may be some root loss. Over fertilizing can cause similar problems. The plant look like it has been in that pot for some time, may be time to repot? As mentioned previously remove damaged leaf and treat with cinnamon.