Black Rot?
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.

Black Rot?
Many perks!
<...more...>


Sponsor
 

Google


Fauna Top Sites
LOG IN/REGISTER TO CLOSE THIS ADVERTISEMENT
  #1  
Old 08-25-2017, 03:53 AM
monet monet is offline
Member
 

Join Date: Aug 2009
Location: OXFORDSHIRE
Posts: 87
Black Rot? Female
Default Black Rot?

Hi everyone, my orchid has what I think is black rot. I have treated it before it is looking very sad. I would like to re pot it. What pot would you use?
Attached Thumbnails
Black Rot?-img_0188-jpg   Black Rot?-img_0183-jpg   Black Rot?-img_0186-jpg  

Last edited by monet; 08-25-2017 at 04:33 AM..
Reply With Quote
  #2  
Old 08-25-2017, 07:26 AM
Dollythehun Dollythehun is offline
Senior Member
 

Join Date: Aug 2016
Zone: 6a
Location: Northern Indiana
Posts: 5,540
Black Rot? Female
Default

Bump.
Reply With Quote
  #3  
Old 08-25-2017, 08:05 AM
Orchid Whisperer Orchid Whisperer is offline
Senior Member
 

Join Date: Jul 2012
Zone: 8a
Location: Athens, Georgia, USA
Posts: 3,208
Black Rot? Male
Default

Not positive it is black rot from the photos.

Repotting now is sort of like re-arranging your furniture when the house is on fire.

Instead, I would focus on cutting off all tissue that is infected. cut into unblemished green, ahead of any color change. Use a flame-sterilized and cooled sharp blade ahead of every cut.

If you arrest whatever infection causes the yellowing, and the plant is recovering, repot in an unglazed terracotta pot, coarse medium.
Reply With Quote
Post Thanks / Like - 1 Likes
Likes Dollythehun liked this post
  #4  
Old 08-25-2017, 09:34 AM
monet monet is offline
Member
 

Join Date: Aug 2009
Location: OXFORDSHIRE
Posts: 87
Black Rot? Female
Default

Hi Orchid whisperer, Thank you for your reply. I did sterilize the blade and used rubbing alcohol on the cuts mixed with cinnamon. I am guilty of using some of the water from another that had drained off a lesson learned. I grew this from 1 leaf and was looking forward to some flowers. My lovely secret love is in full flower the smell is fills the conservatory.
Reply With Quote
  #5  
Old 08-25-2017, 10:25 AM
dounoharm's Avatar
dounoharm dounoharm is offline
Senior Member
 

Join Date: Nov 2008
Zone: 9b
Location: north florida
Posts: 3,384
Default

akkk! looks like too much water to me, and possibly contamination from something....I would open up that root ball, cut off everything with sterilized scissors or knife....

I would mix up some fresh physan and spray everything you are going to use on the plant, including the plant itself....as, I said before, open up the root ball.....in pot bound cases like this, I just cut in 3 places, about an inch from the plant, straight down with my knife. worry those plant roots loose and see whats in the middle.....you might have an unseen problem inside there.....get all the cut and dead roots out and loosen up the rhizomes so you can see it all....cut the damaged portions out.

then, just lay the dissected plant on some newspaper to dry out some....rot is wet, right?....spray every couple days with that physan you mixed up....
do NOT leave it in strong light while it is 'healing'...put it in a shady spot....

after about a week, you can see if it is spreading or not....if it is, just keep cutting till you finally get to the end....orchids can take months out of a pot!

when it starts new growth, and that is clean of rot, just place it in a clay pot, no medium for a couple more weeks....

its a long process, but you should be able to rejuvenate it.....but recall how it got to be that way and adjust your watering....maybe less often? and with fresh water....

cattleyas really like to dry out between waterings, and when you have such a tight root ball, it is probably still wet in the middle when the outer roots look dry....this is why you repot every year or two....

just my 2 cents, good luck!
__________________
HUG YOUR LOVED ONES DAILY!
Reply With Quote
  #6  
Old 08-25-2017, 04:37 PM
Orchid Whisperer Orchid Whisperer is offline
Senior Member
 

Join Date: Jul 2012
Zone: 8a
Location: Athens, Georgia, USA
Posts: 3,208
Black Rot? Male
Default

Quote:
Originally Posted by dounoharm View Post
akkk! looks like too much water to me, and possibly contamination from something....I would open up that root ball, cut off everything with sterilized scissors or knife....

I would mix up some fresh physan and spray everything you are going to use on the plant, including the plant itself....as, I said before, open up the root ball.....in pot bound cases like this, I just cut in 3 places, about an inch from the plant, straight down with my knife. worry those plant roots loose and see whats in the middle.....you might have an unseen problem inside there.....get all the cut and dead roots out and loosen up the rhizomes so you can see it all....cut the damaged portions out.

then, just lay the dissected plant on some newspaper to dry out some....rot is wet, right?....spray every couple days with that physan you mixed up....
do NOT leave it in strong light while it is 'healing'...put it in a shady spot....

after about a week, you can see if it is spreading or not....if it is, just keep cutting till you finally get to the end....orchids can take months out of a pot!

when it starts new growth, and that is clean of rot, just place it in a clay pot, no medium for a couple more weeks....

its a long process, but you should be able to rejuvenate it.....but recall how it got to be that way and adjust your watering....maybe less often? and with fresh water....

cattleyas really like to dry out between waterings, and when you have such a tight root ball, it is probably still wet in the middle when the outer roots look dry....this is why you repot every year or two....

just my 2 cents, good luck!
Whoah Nelly!

I think that is a lot to assume from 3 photos.

It might be a good idea to reduce watering for a bit until whatever infection is under control, but it is not looking dehydrated. Why chop all the roots off?

I stick to my recommendation (35 years growing Cattleyas)
Reply With Quote
  #7  
Old 08-25-2017, 05:07 PM
Optimist Optimist is offline
Senior Member
 

Join Date: Aug 2013
Zone: 7a
Location: New Mexico
Posts: 2,777
Black Rot? Female
Default

To me, that mottling looks like it is in a somewhat higher intensity light than it can physically take. Yellow leaves can also mean that. A good orchid color is about pea-green. Maybe pear-green.
Reply With Quote
  #8  
Old 08-25-2017, 10:39 PM
dounoharm's Avatar
dounoharm dounoharm is offline
Senior Member
 

Join Date: Nov 2008
Zone: 9b
Location: north florida
Posts: 3,384
Default

Whoah Nelly!

I think that is a lot to assume from 3 photos.

It might be a good idea to reduce watering for a bit until whatever infection is under control, but it is not looking dehydrated. Why chop all the roots off?

I stick to my recommendation (35 years growing Cattleyas)

lol, isn't it great? all sorts of ideas popping out....(only 35 years? I can trump that with a degree in horticulture....) I do like to fix things....dig in to find the root of the problem without fiddle-faddle....but, as I said, just my 2 cents worth...take it or leave it....
__________________
HUG YOUR LOVED ONES DAILY!
Reply With Quote
  #9  
Old 08-26-2017, 03:24 AM
estación seca's Avatar
estación seca estación seca is offline
Senior Member
 

Join Date: Jun 2015
Zone: 9b
Location: Phoenix AZ - Lower Sonoran Desert
Posts: 17,755
Black Rot? Male
Default

Were the leaves firm, or wet and mushy? My first thought was sunburn.

And my next thought was calcium deficiency.
__________________
May the bridges I've burned light my way.

Weather forecast for my neighborhood
Reply With Quote
  #10  
Old 08-26-2017, 07:17 AM
Orchid Whisperer Orchid Whisperer is offline
Senior Member
 

Join Date: Jul 2012
Zone: 8a
Location: Athens, Georgia, USA
Posts: 3,208
Black Rot? Male
Default

The more I look at the yellowing, which seems most common near leaf tips, the more I am thinking anthracnose, or a similar fungal disease. I would still consider treating with a SYSTEMIC fungicide like Cleary's (unlikely you will find it in conventional garden centers, should be available online, or if not sold in the U.K., find another systemic fungicide).

Estacion seca is right to suggest that more calcium could help. Calcium is important for disease control.
Reply With Quote
Reply

Bookmarks

Tags
black, pot, rot, sad, waving


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 with black and yellow spots NKOrchid Pests & Diseases 47 10-18-2016 05:49 AM
black spots turn to black rot RJSquirrel Pests & Diseases 2 08-17-2013 11:03 PM
There's no such thing as "true" black. rosemadder Orchid Lounge 12 06-07-2013 02:32 PM
Aranthera Anne Black in Bloom peeweelovesbooks Vanda Alliance - others 9 08-24-2009 08:04 PM
The Black Orchid Graehstone Orchid Lounge 7 12-07-2007 07:56 AM

All times are GMT -4. The time now is 02:19 AM.

© 2007 OrchidBoard.com
Search Engine Optimisation provided by DragonByte SEO v2.0.37 (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.

Clubs vBulletin Plugins by Drive Thru Online, Inc.