Rot on Paphiopedilum?

[estación seca]

Underwatered Paphs get brown leaves that can be mistaken for rot. Cattleyas, too. I think a great many cases of "rot" in windowsill orchids are really underwatering. Then, the grower, thinking it's rot, cuts back watering even more, and the plant gets worse.

Once a week is a long interval for watering Paphs, and every time they wilt a little they are set back, sometimes preventing that growth from ever flowering. Try not to let them go dry during the growing season.