Black leaves on vanda/neofinetia
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 leaves on vanda/neofinetia
Many perks!
<...more...>


Sponsor
 

Google


Fauna Top Sites
LOG IN/REGISTER TO CLOSE THIS ADVERTISEMENT
  #1  
Old 02-22-2019, 05:27 PM
SundayGardener SundayGardener is offline
Senior Member
 

Join Date: Oct 2017
Zone: 5a
Location: Wisconsin
Posts: 173
Black leaves on vanda/neofinetia
Default Black leaves on vanda/neofinetia

Hello,
I'll attach a picture later. What might cause blackening of the newest leaves on neofinetias?

I had one where one leaf after another turned black and fell off, starting at the top. It still has a few viable roots, so I haven't tossed it yet, but I did find some rot at the bottom and removed that. This one was pretty much bareroot because that is how I received it, and I soaked it 2-3 times a week. I also had a wick on the outer roots (not close to the main stem of the plan, and these are the roots that are still alive).

Another is showing the same pattern with the newest growths being black. I really think it is more black than purple...with purple, I would reduce light. But I had already done that with the first neo and it didn't help. This second one is in a coir-lined basket with tree fern and gets soaked 2x week.

I read about fusarium on the vanda threads, but couldn't find a purple ring on the now leafless one...
Reply With Quote
  #2  
Old 02-22-2019, 11:20 PM
Shoreguy Shoreguy is offline
Senior Member
 

Join Date: Jan 2018
Location: Jersey Shore
Posts: 538
Default

Do you water early enough in the day for the leaves to be completely dry by nightfall? New growths are even more vulnerable when being wet as night approaches.

Drenching neos 2 or 3 times a week seems highly excessive even if leaves are dry going into the evening.

Last edited by Shoreguy; 02-25-2019 at 04:23 PM..
Reply With Quote
  #3  
Old 02-23-2019, 01:25 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 leaves on vanda/neofinetia Male
Default

What are your temperatures? Neos need next to no water all winter, and often rot quickly when cool and moist.
__________________
May the bridges I've burned light my way.

Weather forecast for my neighborhood
Reply With Quote
  #4  
Old 02-23-2019, 12:34 PM
stonedragonfarms's Avatar
stonedragonfarms stonedragonfarms is offline
Senior Member
 

Join Date: Aug 2007
Zone: 9b
Location: Gleneden Beach, OR
Age: 48
Posts: 1,309
Default

Reading the above, I'm an outlier, but here it goes:
In the greenhouse (cool/alpine), I'd grow with the parameters that have been mentioned above; ie cool/cold and watering about twice a week, but never so much so as to saturate the moss. Think of it like the plants getting dew in the morning, but no rain.
Inside under lights though, totally different culture [for me]; temps are much higher, and I run lights 14 hours/day. Under those conditions, I water [ie fully saturate the moss] 2x a week, and spray [both foliage & root zone] 2x a day [usually about an hour before lights turn on, about 5.30am, and again about an hour before lights out]; I fertilize year round indoors. Given the temps that I am growing under and circulating fans running 24/7, my neos are usually dry 48-60 hours after their watering.
That said, what you are describing I have seen under a couple different situations:
1. If new growth starts to emerge and plants are then not watered for a long period [under lights and intermediate temps, about 5-7 days], I have had plants abort the developing leaf. It will usually rapidly turn black from the tip down; if you wait about a week, you can typically gently tug it out. If the plant continues to be dry, the roots will start drying near the plant and continue down the length of the root, and the leaves will start to drop from the plant, usually after turning black at the tips or at intermittent points along the leaf. Once the leaves start to fall, just compost the plant--it's almost impossible to save them.
2. There are a few plants in my collection that are sensitive to the combination of high night temps and excessive dryness--any of the Aojiku type varieties can behave this way for me; the developing leaf will rapidly turn black and die. Different from above though, the rest of the plant will keep chugging along; once culture is corrected, another new leaf will grow opposite of where the dead one was.
All that said, what conditions are you growing under? What are your day/night temperatures? What type of pots are you using?
Attached Thumbnails
Black leaves on vanda/neofinetia-img_20181111_090543-jpg  
__________________
I've never met an orchid I couldn't kill...

Last edited by stonedragonfarms; 02-23-2019 at 12:38 PM..
Reply With Quote
  #5  
Old 02-27-2019, 12:47 PM
SundayGardener SundayGardener is offline
Senior Member
 

Join Date: Oct 2017
Zone: 5a
Location: Wisconsin
Posts: 173
Black leaves on vanda/neofinetia
Default

I'm sorry, my home computer stopped working (which means I've been window shopping for power supplies instead of orchids) and I don't think I can post pictures from my phone.

So conditions. I have 3 recently purchased neos that are in moss. Two are in plastic neo pots, and the other is in a plastic net pots. All the others are in tree fern in plastic net pots lined with coir. So far this has worked well.

Current conditions, a few are directly by (about 12" away) a southern window. These are old glass windows without any filters. The others are in my main shelving unit under plastic with humidifier and T5HOs. The ones in moss typically dry within 24-48 hours. For the most part, the ones in tree fern (which I drain thoroughly) have been doing quite well, but there are a few that aren't doing well.

Temps in the house range from 68 to 75 F, under the lights it is warmer but I've noticed that anything wet still feels cold to the touch, so not THAT much warmer.

I would be delighted to not water them 2x week. This is the first time I have been told to water less, hurray for me! My concern has been that my newest neos are quite small and I thought they might need more nurturing.

Now I still have a holcoglossum hanging in there after having a terrible summer and it recently put out a massive new root. I treat it the same as the neos, maybe a little drier.

I do have pictures, I just need to get it together and upload them.
Reply With Quote
  #6  
Old 02-27-2019, 03:17 PM
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 leaves on vanda/neofinetia Male
Default

In habitat they have cool to cold winters with next to no rain. People grow them cool and dry all winter.
__________________
May the bridges I've burned light my way.

Weather forecast for my neighborhood
Reply With Quote
  #7  
Old 02-28-2019, 04:52 PM
SundayGardener SundayGardener is offline
Senior Member
 

Join Date: Oct 2017
Zone: 5a
Location: Wisconsin
Posts: 173
Black leaves on vanda/neofinetia
Default

I've been following this guidance from New World Orchids:

Neofinetia Care: now that it's winter... - New World Orchids

So I water, and let them fully dry out, but then I water again within a few days of their drying out. They tend to dry completely out within 24 hours (less if not in any kind of medium). I don't let them stay crunchy dry for more than 2-3 days because if I do, then I start to see problems. Right now, with the heat cranking, I'm having to water phals in bark twice a week and keep a close eye on everything in semi-hydro.
Reply With Quote
  #8  
Old 02-28-2019, 05:12 PM
Shoreguy Shoreguy is offline
Senior Member
 

Join Date: Jan 2018
Location: Jersey Shore
Posts: 538
Default

Completely “dryed out within 24 hours” in sphagnum???

Are you referring just to the top surface? If so, that’s not completely dryed out.

It is often regarded as proper to water when completely dryed out in the winter although many may disagree and say don't let it dry out completely. During the growing season, you must water before then.

Last edited by Shoreguy; 02-28-2019 at 05:16 PM..
Reply With Quote
  #9  
Old 03-01-2019, 12:28 PM
SundayGardener SundayGardener is offline
Senior Member
 

Join Date: Oct 2017
Zone: 5a
Location: Wisconsin
Posts: 173
Black leaves on vanda/neofinetia
Default

No the spaghnum is dried top to bottom, not just the top. I check it frequently because I am not really comfortable with moss. I didn't want to repot the ones in moss at this time of year. It gets crunchy within 24 hours, then I let it stay that way for 2 days.

That's right now, I think because it has been very cold outside, and hot and dry inside.
Reply With Quote
  #10  
Old 03-01-2019, 12:42 PM
Shoreguy Shoreguy is offline
Senior Member
 

Join Date: Jan 2018
Location: Jersey Shore
Posts: 538
Default

I'm not comfortable with moss either and have been using for over 45 years seedling bark mixed with shredded tree fern and larger bark pieces at the bottom of the pot for drainage. I have always repotted immediately any neos that way upon receipt of those in moss regardless of time of year with no problems.

An advantage of bark with tree fern is that you can get away with repotting every 5 or so years assuming you don't over water or over feed whereas sphag requires frequent repotting.

Last edited by Shoreguy; 03-01-2019 at 12:46 PM..
Reply With Quote
Reply

Bookmarks

Tags
black, purple, roots, soaked, week


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
Black Spots Underneath Phal Leaves Kearneyweard Pests & Diseases 4 07-22-2016 11:42 AM
Black spot & burned leaves, please help! mBluebear Pests & Diseases 2 12-04-2015 06:27 AM
Black spots on Cattleya leaves orchideya Beginner Discussion 7 02-03-2011 10:20 PM
Sansai Blue with questionable black speckles/spots on leaves Sammy Beginner Discussion 5 11-11-2009 01:57 PM
Oncidium/odontoglossum with black spots on leaves HELP hayesraceing28 Oncidium/Odontoglossum Alliance 2 10-28-2009 10:25 AM

All times are GMT -4. The time now is 02:58 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.