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Plants to keep away from Phyton 27?

I have a phalaenopsis that has some bacterial brown spot or other type of infection and I have read that Dendrobiums, Lycastes, and other thin-leaved orchids should be kept away from Phyton 27. Is there any other plants i should keep Phyton 27 away from, or any other dangers i should be wary of before i use it?

I haven't used it myself - hopefully others who have experience with it can help out!

You will be fine using it on Phals, I have. As for other orchids, I don't know other than not using it on Dens.... Sorry.

I've only used Physan 20 and I believe Physan 27 is a different type of product.

I too have used only Physan 20. I avoided the Dends but other than those, I applied to everything else without any problems.

Quote:

Originally Posted by HighSeas (Post 606995)

I too have used only Physan 20. I avoided the Dends but other than those, I applied to everything else without any problems.

HighSeas, you do not use Physan 20 for dendros? I have never ever in my life bought or used any products like these, but I just order physan 20, just in case I would need some since i aquired so many new orchids this year and more on the way. I didn't know physan can not be used on dendros, i guess I must research more if I ever need to use it.

Phyton 27 has copper complex as its major active ingredients. Copper based fungicides should not be used on dendrobiums.

Working solution doesn't last; after a week or two, you'll start to see black precipitation. I've heard that these older working solution is phytotoxic. I don't know the detail, though. So it may be safer to mix the amount you use. But correct me if I'm wrong.

I also tried to find the info about the shelf life of the undiluted original solution. I emailed them, but I didn't get an answer. Does anyone know this?

Quote:

Originally Posted by NYCorchidman (Post 607006)

Phyton 27 has copper complex as its major active ingredients. Copper based fungicides should not be used on dendrobiums.

what about physan 20? and dendros?

Quote:

Originally Posted by naoki (Post 607012)

FAQ | Phyton 27

Quote:

9. What is the shelf life of a bottle of Phyton-27®?
If the bottle has been stored above 45 degrees F, it should have a shelf life of 3-5 years.

When I see the black precipitate (which is the same color as the concentrate), I just shake my sprayer bottle vigorously. Seems to still be okay.

And there's also now Phyton 35:

FAQ | Phyton 35

Quote:

1. What makes Phyton 35 different or better than Phyton 27?
Phyton 35 contains the same active ingredient (copper sulfate pentahydrate) in roughly the same proportion as in Phyton 27. The active ingredient is combined with other ingredients and is absorbed and used throughout the plant to fight disease, just like it is in Phyton 27. Those are the similarities. The Phyton 35 formulation was developed to meet the requirements for food crops and to enable the use of a less restrictive label (Warning not Danger). The products are different, but similar in many ways. Neither is better. Both are designed to meet the needs of growers.