Hello all! My baby roths are suffering the wrath of something...

http://urbansprawl.googlepages.com/rothinfection1.JPG

http://urbansprawl.googlepages.com/rothinfection2.JPG

http://urbansprawl.googlepages.com/rothinfection3.JPG

It doesn't smell like anything terrible. Maybe a very mild sweet smell; barely detectable. I have isolated them out now. My armeniacum x hangianum seemed to be the only other plant that got infected finally. Sigh...what do you think?

p.s. I'm in Japan so my best bet is to mix up some anti-bacterial, anti-fungal pesticides and douse these suckers?

I think is bacterial. So just cut it off and put cinnamon powder. I have had the same thing and it cured it.

Ramon:D

Here's the problem. I've ripped off the bad leaves before. Stuff keeps spreading. Soon, I won't have leaves! :(

As for cinnamon, I don't know how effective that will be. This stuff seems like a beast. How much cinnamon am I supposed to use? If it gets down on the roots, doesn't it burn them? People in Japan don't seem to use cinnamon on orchids...so I don't get much information on it here.

Enough to cover the wound. It does not burn the root.

Ramon

How about the fact that it is spreading plant to plant. How will this stop it? Is there a reason you would recommend avoiding the chemicals?

How about the fact that it is spreading plant to plant. How will this stop it? Is there a reason you would recommend avoiding the chemicals?

Since it is spreadable when you water the plants ( water splashes on the black spots and lands on other leaves as get into one with a small wound it will start to spread) better cut all infected parts and apply some sealer like Cinnamon, neosporin or any antibiotic or fungicide mix with a little water. You can also pour Hydrogen peroxide on the wound and then seal it. You can separate all infected plants and isolate them.

Hope this helps.

Ramon:D

cut the leaf back first (well into the healthy part-don't leave any yellow on it) and apply cinnamon to the cut edge. trust me it works.
avoid splashing water from plant to plant and don't let the plants touch.

also old leaves will turn brown and die back naturally.

Agree I would remove the infected part using a razor blade, very carefully. I would probably treat with a disinfectant like physan for this. Be very careful to follow directions on the bottle for chemicals because seedlings are very delicate. I would use the weakest solution prescribed on the label. I'd unpot the whole plant and soak the entire thing in the solution.

Cinnamon works very well for most fungal infections but I am not so sure if it would do much for a bacterial infection. Physan is a disinfectant as well as a fungicide.

How about the fact that it is spreading plant to plant. How will this stop it? Is there a reason you would recommend avoiding the chemicals?
Chemicals if not used at recommended level may not work.
Chemicals used at recommended level could be too strong for some orchid seedlings.
This is why we are recommending 'safer' alternatives. Dragon's blood (Sangre de Grado) would be the first thing I would use in conjunction with the cinnamon. I have checked local health food stores in the states & most never heard of it, so needless to say it wasn't on the shelf. If you are going to grow seedlings, it is something you should not be without. I've ordered it online, get the pure stuff, not that in an alcohol base.
How much air movement do you have?

Just cut the infected parts off and apply cinnamon , it works for me everytime. Provide more air movement to your grow area.

I am wondering about the potting medium itself.
the infection source may come from the potting mix.
Does any plant that you have in a different & dryer medium show the same symptom ?
-I wonder if the coconut husk is not sterilized/desalted by the manufacturer.
-I once plant my phals in coconut husk, and it kills all my seedlings. turn out it was not sterilized nor desalted by the manufacturer as per advertizing.

I am wondering about the potting medium itself.
the infection source may come from the potting mix.
Does any plant that you have in a different & dryer medium show the same symptom ?
-I wonder if the coconut husk is not sterilized/desalted by the manufacturer.
-I once plant my phals in coconut husk, and it kills all my seedlings. turn out it was not sterilized nor desalted by the manufacturer as per advertizing.

Ah, that's a good question. However, a few plants that I had not repotted are getting it.

I cut back the leaves with my garden scissors after bleaching and firing them. I didn't do it between cuts because I have so many of these youngins. Sorry, I know that wasn't the best idea. I am in Japan. So I don't know about products in america. (Started collecting orchids in Japan). My coworker and I mixed up a spray with the stuff to keep it on the leaves (some sticking agent), the anti-fungal and and anti-bacterial. boy do I hope it is good enough. I was a bit depressed. trying to pull off fully infected leaves. Accidently destroyed one of them...sad. Sigh....I will hope for the best. I sprayed copiously. Plenty into the mix I made. I'm sure I was
WAY too impatient. I know I should I have soaked the CHC more. I just hope they survive. Still figuring out where to keep them now that they can't stay in the tight confines of my shade house. Maybe a garage lighting system and a fan. I also haven't started fertilizing yet, but I'm hoping that will give some vigor to my orchids?

Thank you all!

I certainly hope they recover and grow nicely for you!!! Keep us updated!!!

That stinks!! I hope they fully recover for you!! :fcrossed::fcrossed:

If plants are STRESSED then fertilizer is not going to help their vigor. You haven't had these plants that long, they are trying to adapt to change as well. Could you duplicate the conditions from where these plants came from?
Changes in light, water, air & temps are going to have an effect.

Hope they recover...good luck!:fcrossed::fcrossed:

I think they will be ok.

roths are very tough plants.

it doesn't look like any of the bacterial infection has gotten into the crown.
They will start putting out new leaves after they adapt to the new growing conditions. Just keep an eye out for any infection spreading among the plants and keep them spaced apart with good air circulation.

Speaking of the crowns, there was only one plant that I ever had to cut tissue away from near the crown. We'll see if it survives...

But one thing I have noticed around a few crowns is lots of tiny dark brown sappy dots. Very small...I was thinking maybe mites? It's on 2 or 3 plant crowns.

Would regular plant bug sprays work?

Lee:

yest it could be secondary infection from mites (the mites damage the plant and then bacteria sets in). or scale insect. or just more infection.

you can id the mites if you have a strong magnifying glass--they are tiny tiny tiny. normal bug spray won't work and they come back in waves. spray them off with water/detergent/rubbing alchohol.

the problem is if you have bacterial infection then spraying them with water could be bad and spread more rot.

you should probably just dust with cinamon and make more observations to confirm the problem before putting more gunk on your plants. more pictures would help!

justin

Everyone has given you good suggestions, cut back infected area, treat with cinnimon and isolate. Good air movement is essential, moisture and no air will cause this as well.

John

That is a very common problem in seedlings, also bigger plants at times, it is bacterial and it is spread by watering. Look at the undersides of the affected areas and you will see an oozing sticky liquid this is the stuff that spreads it from plant to plant.

The only thing I have found that may stop it from killing the plant is remove all the affected leaves and then sprinkle the wounds with sulphur powder, I actually use tomato black spot dusting powder which is sulphur and triforine (a funguscide)

Increasing your air movement so the plants leaves dry out quickly will help to stop it starting in the first place, also spraying your plants with a fungucide that is in the form of wettable powder will help put a barrier between the spores and the leaf even though it does leave an ugly residue on the leaves.

Thanks everyone. The roths are couped up in my garage now, door open. They are getting about 600 fc of light midday, so maybe not too much, but they are kept dry and cool. I haven't seen a major break out again. I have to keep my eyes on a few sunken in spots now. I'm using CHC/aliflor/charcoal, so I haven't watered again yet. Being that sprays are mixed with water, should I spray again one more time as my watering?

Lee

I guess that is bacterial. So just cut the infected parts off and put to the cut edge following pesticide.

1) キノンドー or
2) Ｚﾎﾞﾙﾄﾞｳ or
3) ﾍﾞﾝﾚｰﾄ

you will be able to get those pesticide at DIY shop nearby.