Physan 20 and orchid health

[JennS]

I was just wondering how everyone applies their Physan 20. Can you apply it directly to the roots? I am assuming this is Ok, but I just wanted to check. What about Vandas? If applied directly to roots, could it harm the plant, or possibly harm a developing spike?

Reason I am asking is that I have one Vanda that had a developing spike that just died off very early on in the development process. I have no idea why...the 'chid is healthy looking with a nice mass of roots. It usually blooms 2-3 times a year.... The only thing I did different was start using Superthrive once a week (before the spike developed), kept up regular fertilizing, and sprayed the roots once with Physan. I did have to move the plant due to Tropical Storm Fay and bring it inside and after barely one day of being inside the spike started looking brown. After I got home from work last night, the spike was a goner.... Any ideas? My other plants in spike/budding have all been fine...they are not Vandas, though. Any thoughts? Could it be somethign else?