The use of peracetic acid

[littlefrog]

I'm pretty sure that sufficient concentration of acetic acid is toxic to most plants... There is a 'home version' of roundup that some organic farmers use, I think it is straight vinegar.

I question the wisdom of disinfecting plants for most purposes. If you are going to use the tissue for sterile culture, or wish to avoid putting pathogens into an enclosed environment (like a terrarium), then ok. Orchid plants 'in the wild' (or on your windowsill) will never be sterile to begin with. If there is a fungal or bacterial problem, treat the problem (which is usually cultural). I'd use the least toxic method possible first.