Cold damage in cattleyas?
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.

Cold damage in cattleyas?
Many perks!
<...more...>


Sponsor
 

Google


Fauna Top Sites
LOG IN/REGISTER TO CLOSE THIS ADVERTISEMENT
  #1  
Old 02-07-2020, 02:51 PM
Merita Merita is offline
Senior Member
 

Join Date: Aug 2017
Zone: 9b
Location: Orlando, Florida
Posts: 343
Cold damage in cattleyas? Female
Default Cold damage in cattleyas?

Most of my cattleya plants are with spots ranging from purple first to brown and black later. Only a few nights, the temperature has been between 40 * and 45 * F. We have not really had a strong winter and my plants have always been kept outside in other years. How can I follow up on this?
Attached Thumbnails
Cold damage in cattleyas?-e31619ca-8ef7-4d38-9b02-c534caad6036-jpg   Cold damage in cattleyas?-5c422859-9bbc-4a53-8679-dacb98b4d72a-jpg   Cold damage in cattleyas?-b52a9466-5e6f-4a38-804e-c05197162bda-jpg  
Reply With Quote
  #2  
Old 02-07-2020, 03:31 PM
SouthPark's Avatar
SouthPark SouthPark is offline
Senior Member
 

Join Date: Dec 2018
Member of:AOS
Location: Australia, North Queensland
Posts: 5,214
Default

Quote:
Originally Posted by Merita View Post
my plants have always been kept outside in other years
Merita - does this mean that these cattleya plants developed the dark patches while inside the house?

If it is a cold-temperature-related issue, then getting the situation under control should involve shifting the plants to a growing area where the temperature stays within safe limits all of the time. And then allow the orchid to recover. The patches will remain, but hopefully those region dry up - and then will stay very dark for a while, and then maybe change (in the future) to a dry tan/brown colour.


Last edited by SouthPark; 02-07-2020 at 03:35 PM..
Reply With Quote
  #3  
Old 02-07-2020, 03:42 PM
Merita Merita is offline
Senior Member
 

Join Date: Aug 2017
Zone: 9b
Location: Orlando, Florida
Posts: 343
Cold damage in cattleyas? Female
Default

Quote:
Originally Posted by SouthPark View Post
Merita - does this mean that these cattleya plants developed the dark patches while inside the house?

If it is a cold-temperature-related issue, then getting the situation under control should involve shifting the plants to a growing area where the temperature stays within safe limits all of the time. And then allow the orchid to recover. The patches will remain, but hopefully those region dry up - and then will stay very dark for a while, and then maybe change (in the future) to a dry tan/brown colour.

These plants are outside, under the trees, behind the house, they have always been there. I do not know why this winter they are so susceptible to cold, I imagine that something I am doing wrong or maybe sudden changes of the day and night with a lot of humidity too.
Reply With Quote
  #4  
Old 02-07-2020, 04:26 PM
SouthPark's Avatar
SouthPark SouthPark is offline
Senior Member
 

Join Date: Dec 2018
Member of:AOS
Location: Australia, North Queensland
Posts: 5,214
Default

Merita - there are reports of some cattleyas being able to handle relatively low temperatures - even down to mid 40 fahrenheit.

But then there is the uncertainty of just how much a particular cattleya can handle ----- and statistics, such as whether some years may have extra high sunlight intensities or extra low temperatures.

Normally, if the plants are grown within safe limits all of the time, then we won't encounter those effects. But if quantities move out of the envelope for safe growing, then we can encounter situations like that.

Merita - on the other hand ...... if taking a chance is allowed (aka betting), then it may be possible that those catts might be able to take some of the cold-hits. This means that they'll come out bruised, but will just keep on growing (despite getting permanent battle scars).

Also, sometimes the conditions might not just involve absolute temperature and humidity etc, but also rates of change ----- such as how quickly temperature fell (or even how quickly temperature rises - such as very cold, but then gets warmed up by sun at a fairly fast rate).


Last edited by SouthPark; 02-07-2020 at 06:32 PM..
Reply With Quote
Post Thanks / Like - 1 Likes
Likes Fran20 liked this post
  #5  
Old 02-07-2020, 07:11 PM
Merita Merita is offline
Senior Member
 

Join Date: Aug 2017
Zone: 9b
Location: Orlando, Florida
Posts: 343
Cold damage in cattleyas? Female
Default

Quote:
Originally Posted by SouthPark View Post
Merita - there are reports of some cattleyas being able to handle relatively low temperatures - even down to mid 40 fahrenheit.

But then there is the uncertainty of just how much a particular cattleya can handle ----- and statistics, such as whether some years may have extra high sunlight intensities or extra low temperatures.

Normally, if the plants are grown within safe limits all of the time, then we won't encounter those effects. But if quantities move out of the envelope for safe growing, then we can encounter situations like that.

Merita - on the other hand ...... if taking a chance is allowed (aka betting), then it may be possible that those catts might be able to take some of the cold-hits. This means that they'll come out bruised, but will just keep on growing (despite getting permanent battle scars).

Also, sometimes the conditions might not just involve absolute temperature and humidity etc, but also rates of change ----- such as how quickly temperature fell (or even how quickly temperature rises - such as very cold, but then gets warmed up by sun at a fairly fast rate).

I agree with you, this winter has been different, although I still think that the plants are susceptible to everything because I cannot give them an hour of sunshine with low temperatures, in the morning.
Reply With Quote
  #6  
Old 02-07-2020, 09:13 PM
Selmo's Avatar
Selmo Selmo is offline
Senior Member
 

Join Date: Dec 2015
Zone: 5b
Location: West Central Missouri
Posts: 369
Cold damage in cattleyas? Male
Default

Merita, It is hard to tell, but photo 1 the top leaf looks similar to sunburn, and the under leaf looks more like cold water damage. If cold temperatures were the only culprit here, I believe that the flowers would bare the brunt of the damage and they look pretty good. Once again it is hard to tell from just the one picture.
The second photo is hard to tell what is going on there too. Is it shadow or is it damage on the leaf? That bud should tell you if it was cold damage or not. If it blasts then probably cold, if not probably something else. Cattleyas usually can take fairly chilly temperatures. Lower 40s they should be good, maybe even upper 30s, you maybe OK if the plant is healthy and mature.
The third photo, I don’t know if that is cold damage, looks more like one of the leaf spot funguses. But again it is hard to to tell from one photo. I would ask others in your area or at your local society, if they have had similar damage on their cattleyas due to Cold temperatures. All of these plants look as if they will be mildly effected by this and should recover. Make sure to watch for bacterial or fungal out breaks in these damaged areas in the next few weeks.
Reply With Quote
  #7  
Old 02-07-2020, 10:13 PM
Merita Merita is offline
Senior Member
 

Join Date: Aug 2017
Zone: 9b
Location: Orlando, Florida
Posts: 343
Cold damage in cattleyas? Female
Default

Quote:
Originally Posted by Selmo View Post
Merita, It is hard to tell, but photo 1 the top leaf looks similar to sunburn, and the under leaf looks more like cold water damage. If cold temperatures were the only culprit here, I believe that the flowers would bare the brunt of the damage and they look pretty good. Once again it is hard to tell from just the one picture.
The second photo is hard to tell what is going on there too. Is it shadow or is it damage on the leaf? That bud should tell you if it was cold damage or not. If it blasts then probably cold, if not probably something else. Cattleyas usually can take fairly chilly temperatures. Lower 40s they should be good, maybe even upper 30s, you maybe OK if the plant is healthy and mature.
The third photo, I don’t know if that is cold damage, looks more like one of the leaf spot funguses. But again it is hard to to tell from one photo. I would ask others in your area or at your local society, if they have had similar damage on their cattleyas due to Cold temperatures. All of these plants look as if they will be mildly effected by this and should recover. Make sure to watch for bacterial or fungal out breaks in these damaged areas in the next few weeks.
All this has happened in the last weeks, first they are purple spots and they become like this, some darker than others; the tips of the leaves and the edges of several plants are getting like this, I have noticed that for the part that gives more cold air, they are more burned. Cold nights continue with a morning of 99% humidity; I do not doubt that some sunbeam will also enter through a corner. I am constantly watching but always have been. Last year there was colder and nothing happened to them, maybe they have calcium deficiency, I plan to put this on these days. Here I do not know anyone who has orchids and I am very afraid that some disease will sprout, I have only been applying hydrogen peroxide in the spots, once, they have not been enlarged at the moment.
Reply With Quote
  #8  
Old 02-07-2020, 11:48 PM
Selmo's Avatar
Selmo Selmo is offline
Senior Member
 

Join Date: Dec 2015
Zone: 5b
Location: West Central Missouri
Posts: 369
Cold damage in cattleyas? Male
Default

You sure could have a calcium deficiency which can cause the plant to have weakened immune system. Making it more susceptible to environmental, bacterial, fungal damage. The amount of sun shine that would normally not cause any harm, now with the deficiency and the cold temperatures, that amount of sun shine could cause sunburn. Also cold temperatures and high humidity make leaves susceptible to many leaf spot fungus, as leaf surfaces stay ‘wet’ longer. Unable to shed excess moisture, and without adequate air movement, the leaves can not defend themselves against some of these pathogens. You say that the damaged spots are not enlarging, this is good, the cause of this damage has happened, as you say, in the last weeks, the enviroment, (temperature, humidity), now has changed and the pathogens are no longer able to survive. Your plants should recover over time. The cold, even if no damage is visible, will stunt or slow down growth. So they will take extra time to restart to grow and bloom.
Reply With Quote
Post Thanks / Like - 1 Likes
Likes Merita liked this post
  #9  
Old 02-08-2020, 02:32 AM
SouthPark's Avatar
SouthPark SouthPark is offline
Senior Member
 

Join Date: Dec 2018
Member of:AOS
Location: Australia, North Queensland
Posts: 5,214
Default

Merita - is that plant the same one as in this post here?
Reply With Quote
  #10  
Old 02-08-2020, 07:41 AM
isurus79's Avatar
isurus79 isurus79 is offline
Senior Member
American Orchid Society Judge
 

Join Date: Sep 2007
Zone: 8b
Location: San Antonio, Texas
Age: 44
Posts: 10,154
Default

Any chance those leaves were wet and cold at the same time? Dry Cattleyas are fine with those temps. Wet ones can suffer.
__________________
Stephen Van Kampen-Lewis

Pics on Flickr

Instagram

YouTube
Reply With Quote
Post Thanks / Like - 1 Likes
Likes Salixx liked this post
Reply

Bookmarks

Tags
follow, plants, spots, strong, winter


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
Cattleya leaf problem: bacteria? fungus? cold damage? Orchidreamer Pests & Diseases 8 01-04-2013 09:35 PM
Virus or Cold damage in Cattleya? Wfuavenger Pests & Diseases 8 11-16-2012 10:27 PM
Banana & Plaintain Damage...Viewer Discretion Advised. Junebug Off Topic - Totally 0 02-07-2009 10:40 AM
Cold makes leaves limp, leathery... the yuk event Pests & Diseases 2 02-04-2007 08:41 PM
Cold damage jonnygreenthumb Beginner Discussion 7 10-31-2006 11:10 PM

All times are GMT -4. The time now is 06:21 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.