aussie dendrobium dropping leaves :(
Login
User Name
Password   


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

menu menu

Sponsor
Donate Now
and become
Forum Supporter.

aussie dendrobium dropping leaves :(
Many perks!
<...more...>


Sponsor
 

Google


Fauna Top Sites
LOG IN/REGISTER TO CLOSE THIS ADVERTISEMENT
  #1  
Old 07-20-2019, 07:50 PM
neophyte neophyte is offline
Senior Member
 

Join Date: Feb 2016
Location: Bay Area
Posts: 123
aussie dendrobium dropping leaves :(
Default aussie dendrobium dropping leaves :(

my dendrobium hybrid is dropping leaves! i got it a couple years ago and it's bloomed twice now. it was a very robust plant, and i really don't want to lose it now, but I'm not sure why it's dropping its leaves. we had a few hot spells recently; not sure if that's the reason... the plant's potted in sphagnum, which I know isn't ideal for these plants, but I don't water very frequently, so I don't think it's root rot... your thoughts?

edit: a couple of the pseudobulbs look dark brown/black; they're actually just dark red due to sun exposure. the taller growth which lost its leaves is a new growth (grew this year). it lost its leaves before they even matured. the one with yellowing leaves is from last year, i think. both have yellowing pseudobulbs (or canes), and a couple other of the pseudobulbs are starting to turn yellow as well (they used to be green on the shaded side, red on the side exposed to the sun). not sure why this is happening...

second edit: just remembered to say that the plant was placed in the garage for a couple weeks while the new growth was maturing and got transferred back into the house a couple weeks ago. the leaves started to grow after the orchid was placed back into the house (the cane was still growing in the garage). so i'm not sure if the time spent in the garage has damaged it. hopefully this is just environmental damage and not a disease...
Attached Thumbnails
aussie dendrobium dropping leaves :(-img_0691-jpg   aussie dendrobium dropping leaves :(-img_0692-jpg   aussie dendrobium dropping leaves :(-img_0693-jpg  

Last edited by neophyte; 07-20-2019 at 07:57 PM..
Reply With Quote
  #2  
Old 07-21-2019, 10:52 AM
Swimmingorchids Swimmingorchids is offline
Member
 

Join Date: Jul 2019
Posts: 69
aussie dendrobium dropping leaves :( Male
Default

Well, new growth is dying which is not a good sign.

If it was me I would inspect the roots very thouroughly.

Spagnum is naturally antifungal for first 2 years, then it degrades from what I know so if it has been in spagnum for past 2 years I would tip on rot in the rootzone which should be cut away with sterile scissors, then repot in some new media.

Maybe see what someone more experience has to say.
Reply With Quote
Post Thanks / Like - 1 Likes
Likes neophyte liked this post
  #3  
Old 07-21-2019, 01:01 PM
SaraJean's Avatar
SaraJean SaraJean is offline
Senior Member
 

Join Date: Jun 2015
Zone: 9b
Location: New Orleans
Age: 37
Posts: 747
aussie dendrobium dropping leaves :( Female
Default

The pics you uploaded look like your orchid is in bark. Did you recently repot it into sphagnum or vice versa? How did the roots look? Also did this just start happening when you moved it out from the garage into its normal spot?

I have had leaves yellow and drop, or had new growth abort, like this when one wasnít getting watered frequently enough and also when I had one with a poor root system.

It could also just be a response to stress from changing the conditions around. To me, it doesnít look like disease and these bounce back pretty quick even if you do lose a few leaves or a growth.


I can say for sure that it is not from high temps. These seem to be pretty darn tolerant and most of my Aussie Dens can easily handle temps into the 90ís and our occasional low 100ís. One of my species slows down in the heat (Den tetragonum), but not my hybrids. Iím not sure exactly where you are in the Bay Area but much of that area has similar, often better, humidity than I do in the South which helps buffer the heat. Plus you have a MUCH better cool down at night than what I have. I really wish I still lived in Nob Hill or the Sunset district in SF so I could grow some Masdevallias and Draculas and high elevation Dens... sigh
__________________


Instagram: @orchids_and_alcohol

Last edited by SaraJean; 07-21-2019 at 01:12 PM..
Reply With Quote
Post Thanks / Like - 1 Likes
Likes neophyte liked this post
  #4  
Old 07-21-2019, 03:40 PM
neophyte neophyte is offline
Senior Member
 

Join Date: Feb 2016
Location: Bay Area
Posts: 123
aussie dendrobium dropping leaves :(
Default

sarajean,

thanks for sharing your experiences. hopefully it's just a watering issue.

to answer your question, the plant is in sphagnum with a layer on bark on top for aesthetic purposes, and to prevent algae from growing on the moss underneath (blocks the sunlight). the yellowing started a couple days ago, but i moved the plants out several weeks ago. the new growth was severely tilted towards the sun - the cane is curving just a little in the photo, but the leaves were tilted nearly 90 degrees to the window, so i turned the pot around, hoping to encourage the plant to straighten up. it did, and that's when its leaves started to turn yellow. could it be that the plant was trying to straighten up and its water-transporting vessels couldn't deal with the strain? or does the yellowing have nothing to do with that at all?

i'm a little paranoid that maybe it is a disease because I acquired a new miltoniopsis from the farmer's market recently and while it looked healthy, one of its neighbors had these very strange streaked petals almost like impressionist art, which reminded me of virus (although the flower form and plant form was fine). could the leaves dropping be a sign of a virus weakening the plant?
Reply With Quote
  #5  
Old 07-21-2019, 04:40 PM
SouthPark's Avatar
SouthPark SouthPark is offline
Senior Member
 

Join Date: Dec 2018
Member of:AOS
Location: Australia
Posts: 354
aussie dendrobium dropping leaves :( Male
Default

Quote:
Originally Posted by neophyte View Post
the plant's potted in sphagnum, which I know isn't ideal for these plants, but I don't water very frequently, so I don't think it's root rot... your thoughts?

second edit: just remembered to say that the plant was placed in the garage for a couple weeks.
At my place in north-east Australia, the humidity isn't super high, but it's not too low as well. I grow my hard-cane dendrobiums in scoria rock in quite large diameter pots. Some of these are just placed outside among shrubs or trees - out in the open. Their roots are well established, and big bunches of aerial roots, some roots even grew through the bottom holes of the pot and into the soil underneath. I don't have to manually water them at all. Their water just either comes from the lawn sprinklers for watering the grass, or from the air. I don't manually fertilise them. They just get their own nutrients from the ground. And they've been growing like that for 20+ years - undisturbed. Flower buds are forming on the flower spikes at this particular time, right now. I might do an update to show what this all looks like.

The wild dendrobiums here - as expected - hang off trees and/or rocks. The ones appear to just survive and thrive without anybody doing manual watering at all. They can also generally handle direct sun quite well - except for super intense, which some leaves might burn, but doesn't kill the plant.

Adequate air-circulation helps to prevent issues. Maybe having the plant inside a garage for 2 weeks could be the link. This could be important.

Whenever abrupt yellowing or browning occurs, an if there's a lot of it ----- then maybe the first step is to unpot the plant and inspect roots to make sure they're ok. And, if possible, if there's enough pseudobulbs, break off 1 or 2 ----- and grow them separately. That's the nice idea of spreading the eggs out in different baskets. Just like digital data and files ...... having 'backups' is a good thing.

The attached photos only show that dendrobiums can take a real beating from water, and take a real beating from full sun, and just thrive (like in the wild) when they get enough water and air circulation and enough light. They don't even seem to get any viruses, fungal issues, bacteria etc once they've established themselves out in the open.
Attached Thumbnails
aussie dendrobium dropping leaves :(-dendrobium-discolor_img_0912-jpg   aussie dendrobium dropping leaves :(-dendrobium-discolor_img_0915-jpg  

Last edited by SouthPark; 07-21-2019 at 07:28 PM..
Reply With Quote
Post Thanks / Like - 1 Likes
Likes neophyte liked this post
  #6  
Old 07-24-2019, 09:05 PM
neophyte neophyte is offline
Senior Member
 

Join Date: Feb 2016
Location: Bay Area
Posts: 123
aussie dendrobium dropping leaves :(
Default

thank you for the replies! however, i have to report that it's getting worse. the yellowing has spread to another growth (yet another recent growth; it came from last year). would unpotting/possibly repotting the orchid put too much stress on the plant (should I just wait and see)? by the way, the "plant" is actually a mother plant with three keikis. the tallest growths are all from the keikis, which just shows how robust this plant is. you can see why i'm so confused as to why its health is suddenly failing...
Attached Thumbnails
aussie dendrobium dropping leaves :(-img_0699-jpg   aussie dendrobium dropping leaves :(-img_0700-jpg  
Reply With Quote
  #7  
Old 07-24-2019, 10:23 PM
SouthPark's Avatar
SouthPark SouthPark is offline
Senior Member
 

Join Date: Dec 2018
Member of:AOS
Location: Australia
Posts: 354
aussie dendrobium dropping leaves :( Male
Default

Quote:
Originally Posted by neophyte View Post
thank you for the replies! however, i have to report that it's getting worse. the yellowing has spread to another growth (yet another recent growth; it came from last year). would unpotting/possibly repotting the orchid put too much stress on the plant (should I just wait and see)?
I think it's worth repotting. Check the roots to see if they're ok. You could also probably plant the keiki offspring in other pots too. It looks like there's plenty of chance for this plant to recover right now.

One other thing ----- what is that whitish colour on the side of the pot due to? If it is the white colour of salts, then it could mean that the orchid has a problem with accumulated salts in the potting media. But I'm not sure yet.

---------- Post added at 12:23 PM ---------- Previous post was at 12:14 PM ----------

So ....... first thing might be to see if that white material is salt from fertiliser. If so ...... just repot straight away with new growing media. If that's all it is, then the plant should be ok after that.

Last edited by SouthPark; 07-24-2019 at 10:20 PM..
Reply With Quote
  #8  
Old 07-25-2019, 04:21 AM
Swimmingorchids Swimmingorchids is offline
Member
 

Join Date: Jul 2019
Posts: 69
aussie dendrobium dropping leaves :( Male
Default

I did suggest to inspect the roots.
Reply With Quote
Reply

Bookmarks

Tags
dendrobium, dropping, leaves, plants, sphagnum


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
Dendrobium dropping leaves Islander Pests & Diseases 7 06-27-2016 06:12 PM
Orchids dropping leaves ImABrat Beginner Discussion 7 01-22-2011 12:54 PM
B. nodosa dropping leaves...help! Orchidreamer Pests & Diseases 8 01-11-2011 05:51 PM
Dendrobium Leaves Turning Yellow & Falling Off scy Beginner Discussion 37 12-20-2010 12:25 PM
Masdevallia infracta dropping leaves....please help missmorbus Pleurothallis Alliance 15 12-09-2008 12:55 PM

All times are GMT -4. The time now is 07:44 PM.

© 2007 OrchidBoard.com
Search Engine Optimisation provided by DragonByte SEO v2.0.37 (Lite) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.

Clubs vBulletin Plugins by Drive Thru Online, Inc.