my Lc Dinard blue heaven cattleya need help

[poilichu]

My Lc Dinard blue heaven Cattelya have 2 new growth with flower shealths. the flower shealth first emerged with black tip (Picture attached) , then the leave started to turn black and wrinkle and soft. Is it a fugus infection or too much sun? I put is under a south facing trellis with uv protection polycarbonate cover on top of trellis , it is never under direct sun but sometime the leave are a little warm to touch.
what sould I do at this point? will it still bloom?
thanks

[Eyebabe]

It is unusual for black rot (pythium) to go from the top down as it typically originates in the roots; therefore, I want to say it most likely is an overheating/sunburn type injury.

[poilichu]

thanks , I did suspect it got too much sun. I hope it will still bloom

[peeweelovesbooks]

That to me does not look like burn. If you notice, even the bottom of the new growth is black. If it's black AND wet, doesn't sound like sunburn to me.

If I were you I would unpot the plant and see whether anything else is going on with the other pseudobulbs. I would also excise that one with sterile cutting tools and put some fungicide on it.

That's my 2cents.

[WhiteRabbit]

may be more than one issue ? the foliage does look possibly burned, and perhaps the 'sarong' had moisture sitting in it ? The 'sarong' will turn black sometimes, but shouldn't be soggy, so might be some rot AND sunburn. The lower black area - is that area firm or becoming soft?

[poilichu]

I just check that the lower black area is very firm, actually all the pseudobulb with flower sheaths are all firm. only the black sarong was wet if I scratched it

[Eyebabe]

Originally Posted by peeweelovesbooks

That to me does not look like burn. If you notice, even the bottom of the new growth is black. If it's black AND wet, doesn't sound like sunburn to me.

If I were you I would unpot the plant and see whether anything else is going on with the other pseudobulbs. I would also excise that one with sterile cutting tools and put some fungicide on it.

That's my 2cents.

I think it is always better to be safe than sorry. A treatment with Subdue Maxx if you have it available would be worth your while I agree. If you are not able to do this I would not wait too long observing the plant. If new areas appear or it is spreading unlike a sunburn, the surgery is necessary

[poilichu]

thank to everyone.
where could I buy the Subdue Maxx, I google it and find it very expensive.
any alternative?

[Eyebabe]

I recall seeing a forum where someone recommended a substitute that was cheaper...but I cannot find it
At the time I was reading it, it still seemed Subdue Maxx was the choice for Pythium and Phytophthora.
The only other product with my research that comes close to its effectiveness is Banol which is not available in the US or Canada.
Cleary 3336 is a general fungicide but is not effective against Pythium and Phytophthora.
Subdue Maxx is mixed at 4-6 drops per gallon so one quart may last you your lifetime
I have lost two catts to black rot in the past 5 years and cutting back didn't do squat to save them.
When I had another recently, I purchased the Subdue Maxx and it snuffed it out pronto.
I bought mine from Rosemania.com where you can get pretty much any chemical to kill stuff that is available to buy in the US.
Those rose growers are freakin' nuts!

[Eyebabe]

Originally Posted by Eyebabe

Those rose growers are freakin' nuts!

Not sure treating a few household orchids qualifies for this...
http://www.chattanoogarose.org/Spray...e%20Garden.ppt

...but don't forget to use the appropriate precautions when treating