Here are photos of a couple of paphs that have been kept indoors under lights facing an east window. The small plant is a complex seedling and the larger plant in s/h is a BS henryanum. They were in a corner obscured by larger plants and this damage ocurred fairly quickly. I wasn't able to see them clearly for the better part of a month. (This kind of goes with the "How many plants is too many" thread that I read some time ago... apparently I have too many plants indoors!)

I would describe the growing conditions in this corner as low on the humidity side with poor air circulation. Being next to the window, it may have been on the warm side as well.

What is your guess on the pest or disease involved?

Thanks in advance,

Garland Hanson

http://img.photobucket.com/albums/v639/Slipperhead/summerpest2.jpg

http://img.photobucket.com/albums/v639/Slipperhead/summerpest1.jpg

http://img.photobucket.com/albums/v639/Slipperhead/henryanumpest.jpg

This spider mites

Yeah, mites.
Rub the underside of the leaves w/ a cotton ball or pad (or better yet one moistened w/ alcohol.
You'll likely have red "dust" come off onto the cotton ball.

They thrive on conditions w/ low humidity, and they do damage quickly, yes.

stupid mites...
they may be too small to see, but if you have a magnifying glass or photographer's loop, check the lower leaf surfaces too.

you could use predatory mite species to eat the little buggers

the second picture looked a little different
do you have a closer shot

the second picture looked a little different
do you have a closer shot

I kind of wondered about that also. I have a plant that has no mites, but looks a little like your second plant, Garland. I'd check your's for mites, but if you don't find any (check really closely the base of the growths also) I wonder if it could be something else. Maybe fertilizer salt-build up? Totally guessing. I haven't figured out what my problem is yet but plant's gotten very chlorotic, with some of the ends of the leaves having a reddish tinge (and no mites.)

I've kinda given up on the beneficial insects. But I've been real happy with my early results with Ultra fine oil.