Leaf dieback on calanthe

Discussion in 'Problems, Pests, & Diseases' started by TropiCool, Feb 13, 2020.

Slippertalk Orchid Forum

Help Support Slippertalk Orchid Forum:

  1. Feb 13, 2020 #1

    TropiCool

    TropiCool

    TropiCool

    Member

    Joined:
    Apr 30, 2011
    Messages:
    20
    Likes Received:
    2
    Location:
    Maastricht, The Netherlands
    I'm having a lot of trouble with a Calanthe argenteostriata. No matter how I treat it (low water, keeping damp, light seaweed based fertilizer, no fertilizer, shade house culture in Spain, now windowsill culture in the Netherlands) the leaves just keep blackening from the tips downwards, and now the new growth from the edges inwards. Other (evergreen outdoor) calanthes and (windowsill) phaius are not having those problems.
    Despite the size of the new growth and visible pseudobulbs in the somewhat blurry pic I just took, the root mass occupies about 70% of the pot.

    Any other growers successfully dealt with similar problems?

    Thanks!
     

    Attached Files:

  2. Feb 13, 2020 #2

    Linus_Cello

    Linus_Cello

    Linus_Cello

    Well-Known Member

    Joined:
    Aug 18, 2011
    Messages:
    3,009
    Likes Received:
    43
    Location:
    Washington DC, USA
    Try RO or rainwater? Re-pot. My guess is excess salt build up in the media
     
  3. Feb 14, 2020 #3

    TropiCool

    TropiCool

    TropiCool

    Member

    Joined:
    Apr 30, 2011
    Messages:
    20
    Likes Received:
    2
    Location:
    Maastricht, The Netherlands
    Reckon it could be water pH? Both Spain and here in Netherlands have harder water. The dieback was apparent in both locations, in different media. Not much chance of fertlizer salts, but could be already in the water supply. I don't have RO but I could switch to rainwater pretty easily here. Maybe I'll also take it out of the bark and pot in straight gravel.

    The Calanthe argenteostriata is the only one showing these issues. Maybe more sensitive than the others.
     
  4. Feb 14, 2020 #4

    monocotman

    monocotman

    monocotman

    Well-Known Member

    Joined:
    Nov 28, 2009
    Messages:
    1,418
    Likes Received:
    132
    Location:
    Cambridge, UK
    Get yourself a TDS meter off eBay. They are very cheap now (10 euros) and that will tell you exactly what you need to know about water quality. My rain water reads 20 to 30 and the local tap water 450!
    David
     
  5. Feb 15, 2020 #5

    TropiCool

    TropiCool

    TropiCool

    Member

    Joined:
    Apr 30, 2011
    Messages:
    20
    Likes Received:
    2
    Location:
    Maastricht, The Netherlands
    Thanks for the tip. I'll do that.
     

Draft saved Draft deleted

Share This Page

Group Builder
arrow_white