Pete E. Kruzer wrote:
I have a couple Zinnias and two Rose bushes that are starting to get
Japanese Beetles eating them.
I bought the Sevin concentrate. The directions say to mix only as much
as you're going to use. Why?
I was going to mix about 14 ounces of Sevin/water. I won't be able to
use it all. Why can't it be stored?
If you buy the ready to use spray bottle (32 ounces) I won't be able
to use all of it at one time. But I
can store/keep it. Seems to me I should be able to do the same with
the Sevin I mix.

Sevin in water is subject to hydrolysis:

http://www.nysaes.cornell.edu/pubs/fls/OCRPDF/118.pdf

Even at neutral pH, half life of an aqueous solution is 24-30 days.
Much shorter under alkaline conditions.

I guess you could keep solution around a couple of weeks. It will just
be less effective. I would store in a cool place but not freeze as it
could break the emulsion.