anyone used conserve on Paphs and other genera for caterpillars?
any phytotoxicity?

Never had a problem with caterpillars on orchids. I've used BT for tent caterpillars on trees.

the little $%*#ers are all over the greenhouse
the damage on some buds looks like those rat b@!&@%ds
i also pulled a big fat one off one of my phals after i saw almost half the leaf was gone
i've got conserve here, thrips too so i figured two bugs one stone....

What's in conserve?

BT is a toxin produced by a bacteria that generally is infectious to caterpillars. So its very specific for lepidoptera larvae (and I find very effective on the tent caterpillar). And plants are very safe with this.

it's called spinosad
http://www.dowagro.com/turf/prod/conserve.htm
this part is about spinosad, most of the same info, though
http://www.dowagro.com/turf/prod/spinosad.htm

It sounds similar to BT, and very specific to bugs (cholinesterase inhibitor).

I think it would be OK

I honestly believe beautiful butterflies and moths are natures camoflauge for some seriously nasty plant assassins. It's amazing how rapacious those damnable little caterpillars are. Worse than snails in my opinion.

I meticulously search every plant daily for both caterpillar and eggs and you really have to pay attention to find eggs. When I find them, a good squishing is my revenge since I've seen them turn dendrobium leaves into swiss cheese in a matter of hours even at the quarter inch size.