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.


Many perks!
<...more...>


Sponsor
 

Google


Fauna Top Sites
Members O.C.D. Search Today's Posts Mark Forums Read
LOG IN/REGISTER TO CLOSE THIS ADVERTISEMENT
  #1  
Unread 03-04-2013, 03:17 AM
Orquiadicto's Avatar
Senior Member
 

Join Date: Aug 2011
Location: Rubi, Spain (close to Barcelona)
Age: 58
Posts: 758
Male
Default Black spot on Phal amabilis leaf

Yesterday evening I suddenly noticed this on one of the leaves of my Phalaenopsis amabilis variegata. I'm quite sure it wasn't there in the morning (or at least I didn't notice it). What could this be? Should I cut this part of the leaf? Could it spread to other plants? I've put her alone in another location just in case. Thanks for your help and advice.
Attached Thumbnails
Black spot on Phal amabilis leaf-phal-amabilis-leaf.jpg  
Reply With Quote
  #2  
Unread 03-04-2013, 07:56 AM
Cattleya17's Avatar
Senior Member
 

Join Date: Dec 2007
Zone: 6a
Location: Highland Falls In the lower Hudson
Age: 23
Posts: 764
Default

Looks like a sunburn to me. But it's so round and very focused. But it does look like sunburn. Is the wound wet or in anyway softer than the other leaves feel? Make a mark around the margins and see if it is spreading if so cut it off as soon as you can. When you water, do not let water splash on the leaves it can help spread it if it is a rot of some kind. Water only the media or dip the whole pot in water. Sunburn can happen very fast to though.
Reply With Quote
  #3  
Unread 03-04-2013, 09:51 AM
Orquiadicto's Avatar
Senior Member
 

Join Date: Aug 2011
Location: Rubi, Spain (close to Barcelona)
Age: 58
Posts: 758
Male
Default

I discard sunburn. Not at the place I have her. The other ones that are standing before her would have sunburn too. Besides, this leaf is looking towards the inside, to towards the garden. The spot is dry and somewhat sunken. I never water from above. I always inmerse the pot into a pot with water.
Reply With Quote
  #4  
Unread 03-04-2013, 06:38 PM
WhiteRabbit's Avatar
Super Moderator
 

Join Date: May 2008
Zone: 9a
Location: Nor Cal
Posts: 20,225
Default

__________________
-Sonya

Where ever you go, there you are ...
Reply With Quote
  #5  
Unread 03-05-2013, 01:22 AM
james mickelso's Avatar
Senior Member
 

Join Date: Jul 2010
Location: Oceanside, Ca
Age: 65
Posts: 3,365
Male
Default

Could be one of three or four afflictions. Doesn't matter. Cut this out with a new razor or sterilized knife/scissors. Make sure you cut back to healthy tissue. Then dab on some cinnamon with a finger or Q-tip. I just lost nearly all of my phals to capsicum chlorosis. This is not capsicum but could be another virus. Debating what it is doesn't stop it's spread so do surgery right now. Keep it isolated for now or until you know you have contained it. This isn't sunburn as that isn't so well defined. And I doubt it is a cigarette burn. Calling Dr Adicto. Calling Dr. Adicto to surgery.
Reply With Quote
  #6  
Unread 03-05-2013, 01:41 AM
King_of_orchid_growing:)'s Avatar
Senior Member
 

Join Date: Apr 2008
Zone: 9a
Location: Los Angeles, CA
Posts: 7,935
Default

It's a fungal infection. You can tell by what's in the center of the circle - the fungal mycelia is concentrated/isolated right there.
__________________
Philip

Last edited by King_of_orchid_growing:); 03-05-2013 at 01:48 AM..
Reply With Quote
  #7  
Unread 03-05-2013, 02:53 AM
james mickelso's Avatar
Senior Member
 

Join Date: Jul 2010
Location: Oceanside, Ca
Age: 65
Posts: 3,365
Male
Default

Good eye young man. I didn't see it at first. The mycylia are growing out into the surrounding tissue and therefore needs to be cut back further than just around the black scarring. I'd go for twice the distance from the center. And use an antifungal spray on your plant. What do you think the vector is Philip?
Reply With Quote
  #8  
Unread 03-05-2013, 03:34 AM
Orquiadicto's Avatar
Senior Member
 

Join Date: Aug 2011
Location: Rubi, Spain (close to Barcelona)
Age: 58
Posts: 758
Male
Default

Thank you all for your advice. I'll do what you suggest as soon as I get home for lunch.
Reply With Quote
  #9  
Unread 03-05-2013, 10:18 AM
King_of_orchid_growing:)'s Avatar
Senior Member
 

Join Date: Apr 2008
Zone: 9a
Location: Los Angeles, CA
Posts: 7,935
Default

Don't know what the vector is. Could be from water. Maybe it was watered during a cooler part of the day and the water got on the leaf containing the spores, and stayed on the leaf without being dried out before the spores germinated, I really don't know - it's a wild guess.

Could also be an insect that had spores on its body and it landed in that spot, I really can't say this definitively either.

Suffice it to say, something carried the spores there, and I just don't know what it is.

Could just as easily be dumb luck. Fungal spores can be carried by air as well. Just happened to be that some spores may have been airborne and landed on that part of the leaf and germinated, idk.
__________________
Philip

Last edited by King_of_orchid_growing:); 03-05-2013 at 10:21 AM..
Reply With Quote
  #10  
Unread 03-05-2013, 04:12 PM
Orquiadicto's Avatar
Senior Member
 

Join Date: Aug 2011
Location: Rubi, Spain (close to Barcelona)
Age: 58
Posts: 758
Male
Default

It was watered on Saturday 23rd, so about ten days before the spot appeared. I don't think water got on the leave, but well, whatsoever. I did the surgery and hope this way it will just be one single episode.
Reply With Quote
Reply

Bookmarks


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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
The S/H list ScottMcC Semi-Hydroponic Culture 26 04-14-2013 12:26 PM
Black Spots Underneath Phal Leaves Kearneyweard Pests & Diseases 3 01-11-2012 12:41 AM
The leaf on my phal and getting it to bloom en3rmax Beginner Discussion 6 09-30-2011 03:29 PM
wierd spot on phal leaf!!! what is it? Wrebbitrocks Pests & Diseases 14 08-11-2010 10:11 PM
HELP! Big black spot on leaf Kaggy Beginner Discussion 1 09-06-2008 08:22 AM

All times are GMT -4. The time now is 11:05 PM.

© 2007 OrchidBoard.com

Clubs, ShowCase vBulletin Plugins by Drive Thru Online, Inc.

SEO by vBSEO 3.6.0