Yellow spots of phalenopsis 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.

Yellow spots of phalenopsis leaves
Many perks!
<...more...>


Sponsor
 

Google


Fauna Top Sites
LOG IN/REGISTER TO CLOSE THIS ADVERTISEMENT
  #1  
Old 08-27-2022, 08:30 PM
Jbombs Jbombs is offline
Jr. Member
 

Join Date: Aug 2022
Zone: 9b
Location: Orlando, Florida
Posts: 2
Yellow spots of phalenopsis leaves Female
Default Yellow spots of phalenopsis leaves

Does anyone know what these yellow spots are and what to use for it? Yellow spots with a tiny brown spot in the middle. Looks like spots started on the underside of the leaf. We are getting a lot of rain right now and they are probably not drying out enough in between. I've been looking online and my best guess at this point is cercospora fungus. Any help is appreciated! Thanks
Attached Thumbnails
Yellow spots of phalenopsis leaves-img_20220826_093521__01-jpg   Yellow spots of phalenopsis leaves-img_20220827_081907-jpg   Yellow spots of phalenopsis leaves-img_20220826_093603-jpg   Yellow spots of phalenopsis leaves-img_20220826_093512-jpg   Yellow spots of phalenopsis leaves-img_20220826_093516-jpg  

Reply With Quote
  #2  
Old 08-27-2022, 08:36 PM
estación seca's Avatar
estación seca estación seca is online now
Senior Member
 

Join Date: Jun 2015
Zone: 9b
Location: Phoenix AZ - Lower Sonoran Desert
Posts: 17,755
Yellow spots of phalenopsis leaves Male
Default

Welcome to the Orchid Board!

The most likely causes are necrotic zones around areas where insects took bites, and some kind of fungus due to your recent high humidity.

Phals in nature grow hanging sideways so rain drains out of the crown and down the leaves. Consider potting and/or mounting them like this. I think Orlando is too far North to mount on trees outside, but people in the Miami region are able to do this.

Fungicide won't help for long. I suggest figuring out how to improve leaf drainage and air circulation.

The medium for the Dendrobium looks very old. When was it last repotted? This plant might do well mounted on the branch of a deciduous tree outside, if you can ensure it doesn't suffer frost damage.
__________________
May the bridges I've burned light my way.

Weather forecast for my neighborhood
Reply With Quote
  #3  
Old 08-27-2022, 09:18 PM
Jbombs Jbombs is offline
Jr. Member
 

Join Date: Aug 2022
Zone: 9b
Location: Orlando, Florida
Posts: 2
Yellow spots of phalenopsis leaves Female
Default

Thanks for the info. My intention is to mount them on some hanging driftwood that I can move into the greenhouse in winter. They've been a little neglected due to a family health issue, but I'm going to move them out of the rain tomorrow and work on them. What do you suggest for treatment right now? A fungicide or pesticide? Any particular brand? Thanks!!!
Reply With Quote
  #4  
Old 08-27-2022, 10:00 PM
estación seca's Avatar
estación seca estación seca is online now
Senior Member
 

Join Date: Jun 2015
Zone: 9b
Location: Phoenix AZ - Lower Sonoran Desert
Posts: 17,755
Yellow spots of phalenopsis leaves Male
Default

I don't grow in such a high humidity environment so I don't know what happens in Orlando. I don't use fungicides.
__________________
May the bridges I've burned light my way.

Weather forecast for my neighborhood
Reply With Quote
Reply

Bookmarks

Tags
drying, fungus, guess, spots, yellow


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
Green ring spots on yellow leaves jmlindy422 Pests & Diseases 2 03-31-2022 03:27 PM
Maxillariella elatior -- cause of yellow and black spots leaves? MJG Maxillaria Alliance 5 06-20-2020 05:51 PM
Phal Bellina Yellow Spots Manu Pests & Diseases 49 06-10-2017 10:55 PM
Small yellow & black spots on oncidium leaves butterfly_muse Beginner Discussion 2 04-11-2015 08:46 AM
yellow leaves and black spots - please help elsalex83 Beginner Discussion 14 06-08-2010 04:23 AM

All times are GMT -4. The time now is 12:50 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.