Cattleya black new Leaf tips
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.

Cattleya black new Leaf tips
Many perks!
<...more...>


Sponsor
 

Google


Fauna Top Sites
LOG IN/REGISTER TO CLOSE THIS ADVERTISEMENT
  #1  
Old 09-23-2014, 01:13 PM
braxtonds braxtonds is offline
Member
 

Join Date: Aug 2011
Posts: 52
Cattleya black new Leaf tips
Default Cattleya black new Leaf tips

I have a Blc. Orange Nugget x C. lawrenceana 'Blushing' orchid growing in a 6" clay pot with coco/bark mix that is 1/3-1/2 filled with a net pot/lava rock on the bottom for drainage. I tended to overwater in the past so I tried for this drier combination this time when I repotted this past spring.

Here is the plant:


I haven't had any major issues at all with this plant until this year. Most if not all the new growths have developed black tips. They seem to dry up and prevent the new leaf from opening. The new growth can be seen because they are more purple/red than the old growths.





In addition, a few large black spots have occurred and appear to go right through the entire leaf. I keep my entire collection outside all summer, under the porch roof (no rain water.) I water either from hose or excess pond water so the water can set on the leaves but tends to be mostly dry by night since I try to water in the morning or midday. I live in Ohio so the nights are colder.

Any ideas would be greatly appreciated. Thanks.
Reply With Quote
  #2  
Old 09-23-2014, 01:28 PM
Leafmite's Avatar
Leafmite Leafmite is offline
Senior Member
 

Join Date: Sep 2010
Zone: 5b
Location: Ohio
Posts: 9,782
Cattleya black new Leaf tips
Default

Do you give your Cattleyas extra calcium? If not, start. I use eggshells for long-term (they have to decompose to release calcium so this is not immediately helpful) but you will probably need to find a supplement to help now.
Why do I suggest this? Some years ago, I switched from using my goldfish pond water to distilled water and orchid fertilizer. I did not realize that orchid fertilizer did not contain enough calcium for my orchids (most fertilizers that are specific contain whatever that particular group of plants need but not orchid fertilizers, apparently). In the fall, I discovered 'black rot' which wiped out most of my Cattleyas and some of my other orchids. It was caused by calcium deficiency. So, when I hear of this sort of thing happening with Cattleyas, my mind always jumps to calcium deficiency. Good luck!
Reply With Quote
Post Thanks / Like - 1 Likes
Likes tucker85 liked this post
  #3  
Old 09-23-2014, 01:28 PM
campchi campchi is offline
Senior Member
 

Join Date: Jun 2013
Zone: 10b
Location: los angeles, california
Posts: 431
Cattleya black new Leaf tips Male
Default

Maybe sun burn? Not sure what causes...maybe someone with more experience can pointed out.
Reply With Quote
  #4  
Old 09-23-2014, 04:31 PM
Oscarman's Avatar
Oscarman Oscarman is offline
OB Admin
 

Join Date: Jun 2005
Zone: 3a
Location: Edmonton, Alberta. Canada
Posts: 2,894
Default

The reddish color in the new growths to me says maximum light is being experienced. The leaf tips.....too much light, calcium deficency....I am leaning towards the light issue.

The black oval black spot looks like heat/light stress - overheated tissue dying and collapsing. I have it on a C. dowiana too!
__________________
DaveW
"Every time you spend money, you're casting a vote for the kind of world you want." ~Anna Lappe

My Orchid Photos

New to forums? - Tips to Get you Started ---- Tips for posting Photos
Need to find basic care info? - Care Sheets
Need further help using this forum? - Send me a PM
Reply With Quote
  #5  
Old 09-24-2014, 01:58 PM
braxtonds braxtonds is offline
Member
 

Join Date: Aug 2011
Posts: 52
Cattleya black new Leaf tips
Default

Thanks, no, I don't use calcium and I'll definite look into it. Would you suggest crushed oyster shells? I don't eat enough eggs for my whole collection haha. How do I know how much to add to the pot. Also, with winter that cuts down the sun and heat, that should help me identify if the spots were caused by sun damage.
Reply With Quote
  #6  
Old 09-24-2014, 02:52 PM
campchi campchi is offline
Senior Member
 

Join Date: Jun 2013
Zone: 10b
Location: los angeles, california
Posts: 431
Cattleya black new Leaf tips Male
Default

You can go to any pet store to buy calcium bome that are for birds...that can be use as well. It's cheap, I usually get it like $1/piece.
Reply With Quote
  #7  
Old 09-24-2014, 03:08 PM
silken's Avatar
silken silken is offline
Super Moderator
 

Join Date: Feb 2009
Zone: 2b
Location: Saskatchewan, Canada
Posts: 9,667
Default

To me it looks like sun burn and heat stress too. But I am a convert to Cal/Mag supplementint also after having un-explained black spots on a lot of my orchids-mostly Catts. So far it seems to make a difference. I got a supplement from a hydroponics store.
Reply With Quote
Post Thanks / Like - 1 Likes
Likes tucker85 liked this post
  #8  
Old 09-24-2014, 05:02 PM
NYCorchidman NYCorchidman is offline
Senior Member
 

Join Date: Nov 2011
Posts: 7,196
Cattleya black new Leaf tips
Default

I second the sun burn on the black oval marks.

Overall, the plant looks heat stressed.
Do you leave this cattleya out in the sun??
Reply With Quote
  #9  
Old 09-24-2014, 06:09 PM
braxtonds braxtonds is offline
Member
 

Join Date: Aug 2011
Posts: 52
Cattleya black new Leaf tips
Default

I leave the orchids on the porch under a roof, it receives sun till around 11am-noon
Reply With Quote
  #10  
Old 09-25-2014, 11:11 AM
tucker85's Avatar
tucker85 tucker85 is offline
Senior Member
 

Join Date: Sep 2009
Zone: 10b
Location: Plantation, Florida
Age: 74
Posts: 5,994
Default

I agree with Leafmite and Silken, any time new cattleya growth gets fungus problems, it's a sign that the plant is not getting enough calcium. The crushed oyster shell, that you mentioned, is one possibility. Some growers use dolomite lime to increase calcium. Another option is to switch to a cal/mag fertilizer. Personally I use a supplement called MagiCal that you can buy in hydroponics stores.
Reply With Quote
Reply

Bookmarks

Tags
black leaves, black spots, black tips, leaf, water, tips, black, cattleya


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 black spot bil Beginner Discussion 25 07-24-2014 09:29 PM
1 Phal w/yellow leaf, large black spots, 1 Phal w/red leaf & dying roots elaines Beginner Discussion 4 02-02-2011 09:27 PM
orchid newbie: Psychopsis Kalihi with soft, yellow & black leaf groundpounder17 Beginner Discussion 17 08-20-2010 12:30 AM
Phalaenopsis with black leaf spots and leaf bump ThreeChids Pests & Diseases 2 07-12-2010 10:23 PM
Phalaenopsis Leaf tip/edge turn black kenngks Beginner Discussion 19 03-04-2009 08:05 PM

All times are GMT -4. The time now is 02:45 PM.

© 2007 OrchidBoard.com
Search Engine Optimisation provided by DragonByte SEO v2.0.37 (Lite) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.

Clubs vBulletin Plugins by Drive Thru Online, Inc.