Dendrobium Blight?
User Name

Registration is FREE. Click to become a member of OrchidBoard community
(You're NOT logged in)

menu menu

Donate Now
and become
Forum Supporter.

Dendrobium Blight?
Many perks!



Fauna Top Sites
Old 12-02-2017, 05:57 PM
ampaud's Avatar
ampaud ampaud is offline
Jr. Member

Join Date: Dec 2016
Location: Santa Rosa, California
Posts: 14
Dendrobium Blight? Female
Default Dendrobium Blight?

Hello everyone! I need a little help.

Every time I have purchased a Dendrobium, they have always looked great, nice and green, pseudobulbs plump, and no signs of pests. I always check existing blooms (if there are any) for streaking so as not to bring viruses into my home.

However, every time I bring them home, they seem to be affected by the same disease. I have now lived in two homes and make sure to keep my plants quarantined if they are newcomers. The first time this happened, I had acquired a Little Atro Dendrobium that was just beautiful and had lots of blooms - and the leaves just started showing yellow areas and spots. The spots quickly spread from leaf to leaf, and eventually killed the plant, as well as the Bruce Gordon that I stupidly kept nearby at the time.

Now, I am smarter and generally a better cultivator, so I was brave when I picked this one up last week. She was gorgeous, had nice, tall flower spikes and everything looked ok, her leaves just needed to be washed. And what do you know - - but the spots are here! This time I was wise enough to take a picture.

What is this?? Is there any way to identify it on a plant before I purchase it? Is there anything I can do to stop it from spreading? I am including pics of the flowers, the most recently impacted leaf top and bottom, and the leaf above it (the infected leaf looked like this healthy leaf just a day ago, then last night I saw the spots!)

Thank you!!
Attached Thumbnails
Dendrobium Blight?-img_0609-jpg   Dendrobium Blight?-img_0610-jpg   Dendrobium Blight?-img_0611-jpg   Dendrobium Blight?-img_0612-jpg  
Reply With Quote
Old 12-02-2017, 06:02 PM
Dollythehun's Avatar
Dollythehun Dollythehun is offline
Senior Member

Join Date: Aug 2016
Zone: 6a
Location: Northern Indiana
Posts: 2,302
Dendrobium Blight? Female

I don't have a clue but, I'll be interested to find out with you.
Reply With Quote
Old 12-02-2017, 08:06 PM
estación seca's Avatar
estación seca estación seca is offline
Senior Member
Dendrobium Blight?

Join Date: Jun 2015
Zone: 9b
Location: Phoenix AZ - Lower Sonoran Desert
Posts: 7,403
Dendrobium Blight? Male

How warm is the growing area? How are you watering?

This kind of Dendrobium does not like cool temperatures, and does not like drying out for very long. The leaves with spots look wrinkled. When Den phalaenopsis types don't get enough water, their leaves can die like this. The fungal spots are attacks on weakened leaves.
It's a dry heat.
Reply With Quote
Old 12-02-2017, 08:17 PM
ampaud's Avatar
ampaud ampaud is offline
Jr. Member

Join Date: Dec 2016
Location: Santa Rosa, California
Posts: 14
Dendrobium Blight? Female
Default Thank you!

I will try to put her in a warmer spot if that is the case - she should do well with my paphs upstairs then. Fingers crossed!
Reply With Quote
Old 12-02-2017, 09:33 PM
Selmo's Avatar
Selmo Selmo is offline
Senior Member

Join Date: Dec 2015
Zone: 5b
Location: West Central Missouri
Posts: 232
Dendrobium Blight? Male

Dendrobiums don't like it when their environments are changed. Many plants drop their leaves when stressed by changes in their surroundings. What ever the spots are,where there unseen and as the plant stressed it became visible. The yellowing of the leaves is normal acclamation to your environment. As the growing conditions at the nursery are different than yours. The spots look odd because of the darker green halo around the sunken black spot. Usually the halo is yellow or lighter green. Darker green would suggest the presence of nitrogen. Either the fungus/bacteria are producing nitrogen as they multiply or this could be from fertilizer water droplets setting on the leaves to long causing burn spots, like dog spots in the lawn. Just a guess, as you say this spreads from leaf to leaf and to a different plant. If this is fungal/bacterial it would be spread by splashing water. I just don't know about pseudomonas or one of the leaf fungi having darker green halos. Any way, I would remove the infected leaves as soon as possible and isolate the plant from others. Give it more light and air movement, water from below minimizing leaf wetness.
Reply With Quote
Old 12-07-2017, 03:15 AM
camille1585's Avatar
camille1585 camille1585 is offline
Super Moderator

Join Date: Oct 2007
Location: middle of the Netherlands
Posts: 10,911

My experience with the Dens I've had (and killed until recently!) is that they are very prone to spots of all sorts and yellowing if the air movement isn't sufficient and they are left too dry between waterings. Ever since I improved those 2 aspects my Dens have stayed healthy, and alive!

Completely orchid obsessed and loving every minute of it....

My Orchid Photos
Reply With Quote


dendrobium, leaf, looked, spots, time

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Orchids with a strong scent razka3 Beginner Discussion 253 09-26-2017 04:32 AM
Finished an inventory of my orchids. Kevin_PR Outdoor Gardening 23 03-03-2015 05:40 PM
Dendrobium types? ilikeorchids Beginner Discussion 19 07-20-2014 07:36 PM
Have you EVER seen orchid list like this??? TOMMYMIAMI Greenhouse Gardening 28 04-06-2014 02:47 PM
Dendrobiums? Kali Hibiscus Terrarium Gardening 3 10-17-2011 09:04 PM

All times are GMT -4. The time now is 06:38 PM.

© 2007
Search Engine Optimisation provided by DragonByte SEO v2.0.37 (Lite) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

Clubs vBulletin Plugins by Drive Thru Online, Inc.