Ctna 'Why Not' sick leaves - Orchid Board

RandomGemini · #1 07-11-2014, 05:52 PM

Seems like some sort of fungal infection to me.

Hopefully someone with more knowledge can chime in.

VickiC · #2 07-13-2014, 06:13 PM

Thanks for replying!
Vicki

Quote:

Originally Posted by RandomGemini

Seems like some sort of fungal infection to me.

Hopefully someone with more knowledge can chime in.

---------- Post added at 04:37 PM ---------- Previous post was at 04:32 PM ----------

Thanks for taking time to look the info up for me! I should have thought to do it myself.

Vicki

Quote:

Originally Posted by Nexogen

http://www.google.ca/url?sa=t&rct=j&...70810081,d.aWw

(page 25) Bacterial Brown Spot. Acidovorax (syn. Pseudomonas).

Prevention: Pseudomonas cattleya is a water-borne pathogen that prefers warm, moist conditions. Reduce humidity and temperature (if possible), eliminate overhead watering and increase air circulation.

Treatment: Immediately remove infected tissue and spray the plant with a bactericide like Physan or copper compounds following label instructions. Disinfect growing area with 10% bleach solution.

---------- Post added at 05:13 PM ---------- Previous post was at 04:37 PM ----------

Hi James,

After reading your advice, I did a total disinfect of the entire greenhouse. As for that one particular plant, I did cut the leaf off and apply cinnamon to the wound. Afterwards, I treated the plant with Thiomyl. I know the bottle says it is a fungicide, but it was the only "big guns" product I had (I used it on a fungus infection late last summer). I hope Thiomyl was ok for this ??

I don't water overhead, but I do mist my mounts heavily with a pump sprayer and have a misting system, as well, so moisture may have accumulated on the leaves of this plant too much - so I plan to re-think the water overspray issue. It's very hot here in Alabama at this time of year. My greenhouse is like a furnace. I'm doing my best to keep the temp. down as much as possible, but unfortunately, I haven't mastered that yet (not sure if I'll ever be able to). The airflow seems to be good, the humidity from 55-65% during the day.

Thanks for your help,
Vicki

Quote:

Originally Posted by james mickelso

Bingo. Very nasty stuff. Looks like you have a good collection so disinfect everything. I would get a pump sprayer and spray everything down. If not, you can just cut off the infected leaf and dab powdered cinnamon on the cut with a Q-Tip. I get this all the time and that's what I do. But then again, I don't water overhead. I get no water on any of my leaves. I just water the media.