here you go and heres a link to the pdf.
http://www.ohp.com/Labels_MSDS/PDF/floramite_label.pdf
it says it last up to 28 days. and looks like its a 1/4-1/2 teaspoon per gallon
USE RATES AND RECOMMENDATIONS
Mix 4 to 8 fluid ozs.
FLORAMITE SC in 100 gals. of water (1⁄4 -
1⁄2 tsp./gal) and apply as a full coverage spray to the foliage
using a volume of 1-4 qts. of final solution per 100 sq.ft. (or 100 -
400 gals. per acre). Actual spray volume will vary depending on
the size of plants being treated. Application should be made as
soon as mites appear and will provide residual control for up to
28 days. Use the low rate for preventative applications or where
mite infestations are light. The higher rate may be required for
heavy infestations or for extended residual control. For optimum
coverage of ornamentals with hard to wet foliage, an adjuvant
can be added to the
FLORAMITE SC/water solution. Those
found to be effective are Silwet 77® or Sylgard 309® at 4 oz. per
100 gallons of water. Users should test safety and compatibility
of all adjuvants prior to commercial use. Do not use adjuvants in
solutions applied to greenhouse tomatoes.
When used as a directed,
FLORAMITE SC is effective for the
control of a variety of mites species, especially spider mites, red
mites and grass mites. NOTE: It is not effective against rust
mites, broad mites and flat mites.
FLORAMITE SC is primarily
active on the motile stages of mites, but also has ovicidal activity
against spider mites (Tetranychus species). Common mite
species controlled by
FLORAMITE SC include: