Go Back   Orchid Forum Orchid Care > Orchid Care > Orchid Pests and Diseases

Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 07-23-2010, 05:17 AM
Aleksa's Avatar
Member
 
Join Date: Jun 2007
Location: Montenegro (South Europe)
Posts: 428
Thanks: 12
Thanked 14 Times in 10 Posts
Aleksa is on a distinguished road
Cattleya problems

Hi people! I've been busy with college for a while, but I'm back again.

I've been growing this catt, for a few years and plant grew extremely well. It bloomed every autumn, with lots of flower stalks. I wasn't home for about year and my mother took care about the plant. When I arrived, plant seemed to be just fine, so I repotted it in larger pot like this http://www.hidroponika.com/slideshow...24020a4c8c1410

I didn't disturbed a root ball (which was incredibly compact and tight), so I just added more media around old roots. I used mix of coco chips, and clay pellets.

I placed it on a highest shelve in a greenhouse so it could get more light. After a few days I noticed a few sunburnt leaves. I removed them and placed the plant on a shadier place. Since than, plant virtually stopped growing, I noticed little black spots on almost every leaf, and some larger infection on another leaves. There are the pics. I'm thinking about fungal infection.

One more thing, temperatures are extremely high these days, about 40 degree Celsius, which might have influenced on infection spreading.

Is there anything I can do? I really wouldn't like to loose this plant since it was my healthiest, biggest and strongest orchid.


Cheers!
Attached Thumbnails
dscf0810.jpg   dscf0811.jpg   dscf0812.jpg   dscf0813.jpg  
Reply With Quote
  #2 (permalink)  
Old 07-23-2010, 05:57 AM
digitalgate's Avatar
V.I.P Member
PhotobucketPhotobucketPhotobucketPhotobucket
 
Join Date: Oct 2007
Location: singapore
Posts: 3,108
Images: 12
Thanks: 316
Thanked 1,030 Times in 630 Posts
digitalgate is on a distinguished road
look like your plant is suffering from spider mites. You might want to use a tissue and wipe the leaf and see if the "dust " is red or yellow. Look carefully and see if the dot is moving.
Reply With Quote
  #3 (permalink)  
Old 07-23-2010, 06:20 AM
Junior Member
 
Join Date: Feb 2010
Location: North Shore Sydney Australia
Posts: 28
Thanks: 95
Thanked 21 Times in 13 Posts
Yvonne is on a distinguished road
It does look like sunburnt and a dose of spider mites too. Good luck. Did you rinse the coco chips well, they tend to contain a high percentage of salt. I have been told to soak them, then rinse them. All the best.
Reply With Quote
  #4 (permalink)  
Old 07-24-2010, 12:27 AM
orchids4me's Avatar
Super Moderator Photobucket
Photo Sharing and Video Hosting at PhotobucketPhoto Sharing and Video Hosting at PhotobucketPhoto Sharing and Video Hosting at PhotobucketPhoto Sharing and Video Hosting at Photobucket
 
Join Date: Apr 2010
Location: East bay area, California.
Posts: 10,832
Thanks: 10,154
Thanked 4,422 Times in 3,810 Posts
orchids4me is on a distinguished road
I see sun burnt, are there any tiny webs? Good thing you took it out of direct sun. If plants are not originally in full sun you have to do it gradually so they adapt if are not use to it. Get some air flow around it to help prevent fungal infection.
Emmaye
__________________

Daisy 2003 -2013
Life is too short.... Buy more orchids!!!!

Emmaye
Reply With Quote
  #5 (permalink)  
Old 07-24-2010, 03:36 PM
Member Photobucket
PhotobucketPhotobucketPhotobucketPhotobucket
 
Join Date: Sep 2007
Location: Central New Jersey
Posts: 1,471
Thanks: 0
Thanked 387 Times in 320 Posts
11Orchid126 is on a distinguished road
It looks like a bit of sunburn, fertilizer residue, and mites. Take a damp cotton ball and wipe the underside of the leaves. If you see specks, you have spider mites. You will need a miticide especially for spider mites. An insecticide won't kill them. Use it three times, seven days apart, and be sure to treat the medium as eggs lurk there.
Reply With Quote
  #6 (permalink)  
Old 07-24-2010, 04:51 PM
Aleksa's Avatar
Member
 
Join Date: Jun 2007
Location: Montenegro (South Europe)
Posts: 428
Thanks: 12
Thanked 14 Times in 10 Posts
Aleksa is on a distinguished road
Thanks guys! No, there are no spider mites, I double checked, those spots are coming from within the leaf, they remind me on fungal and bacterial infections on Phalaenopsis. I've had a few cases like this, and my experience tells me that I cannot do much. Fungicides are usually not effective against this, 'surgery' only seems to help. I'll probably remove infected leaves and hope that other spots do not start to spread. If they start, the plant is dead...
Reply With Quote
  #7 (permalink)  
Old 07-24-2010, 07:57 PM
patticake's Avatar
V.I.P Member Photobucket
PhotobucketPhotobucketPhotobucketPhotobucket
 
Join Date: Nov 2007
Location: Halfmoon, NY
Posts: 8,173
Images: 3
Thanks: 3,167
Thanked 1,954 Times in 1,166 Posts
patticake is a glorious beacon of lightpatticake is a glorious beacon of lightpatticake is a glorious beacon of lightpatticake is a glorious beacon of lightpatticake is a glorious beacon of lightpatticake is a glorious beacon of light
Aleksa! Hi!! It's good to hear from you! I hope school is going well for you. The sudden increase in light can burn a catt pretty fast.
Is there good air circulation up where it was?
I would say that you could move it back there, but gradually. Having just re-potted it, the roots hadn't had a chance to grab hold of their new environment yet. You may have to water the edges a little more often where the new mix is. (Just until the roots start to grab hold)
We've had really hot weather here, too. Mine have needed a little more water to keep up with the heat, and a little more air circulation to keep the humidity from being so intense that nasty stuff can start growing.
Take care, and happy growing! Give your mom a hug for taking care of your chids while you were away, too!
__________________
Patti
Reply With Quote
Reply



Thread Tools
Display Modes

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
Overwatering problems...Did I go too far the other way? Bethesda Newbie Questions 23 09-02-2009 01:04 PM
If you're still having problems try this jbigio Masdevallia herraadurae growing project 3 05-28-2009 10:24 AM
Problems with my phal moki Newbie Questions 5 11-23-2006 07:38 AM
problems with my phal moki Newbie Questions 13 11-22-2006 05:40 PM






Free Vote Caster from Bravenet.com Free Vote Caster from Bravenet.com


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.0
Orchid Forum

vBskin developed by: CreationLab