I have a rather extensive collection of old bottles of pesticides, but
I'm out of Kelthane. :-( Also, I think "Black Leaf 40" (nicotine
sulfate) is not approved for roses.

What other insecticides are *effective* against mites? Some are listed
but don't work very well because mites are not insects. How about
horticultural oil? I have a bottle of dormant oil spray that I can mix
half-strength for a summer oil spray... Will that work? Thanks.

Bob