Fungicide safety for orchid use

[Ray]

As a preventive measure, I highly recommend Zero-Tol. It is a great broad-spectrum, contact algaecide/fungicide, and exhibits no phytotoxicity whatsoever.

[keithrs]

Originally Posted by Ray

As a preventive measure, I highly recommend Zero-Tol. It is a great broad-spectrum, contact algaecide/fungicide, and exhibits no phytotoxicity whatsoever.

Do you know if there's a difference between Zerotol for pro's and the Zerotol RST?

[Ray]

Originally Posted by keithrs

Do you know if there's a difference between Zerotol for pro's and the Zerotol RST?

Just the concentration of the as-shipped product.

Zero-tol in the 2.5 gallon (smallest) container is 27% active ingredients, which being oxidizers, makes it a DOT hazardous material for shipping. The RTS (Ready To Spray) quart bottle is 6.7%, making it non-hazardous.

The application concentration would be the same, so when I refill the RTS bottle from my big jug, I make a 25% solution to use in the 150:1 RTS sprayer.