Weevils can be persistent, and may be difficult to eradicate. I have
has weevil infestations in the past, and was able to get rid of
them without chemicals. I don't guarantee this will work for you, but
you might want to try it.

When weevils (or any other serious infestation occurs, e.g., beetles)
are found:

1) Check *all* unprotected foods for infestation. Unprotected foods are
those in paper bags, plastic bags, or foods in containers that are not
bug-proof.  (If the infestation occurred in a bug-proof container, you
should check other bug proof containers as well).  Discard all infested
foods: take them *directly* to the garbage can; do not let them sit in
your kitchen!

2) Store all remaining foods in bug-proof containers: glass or plastic
jars.  Alternately, refrigerate or freeze foods that are susceptible to
infestation.

3) Check the foods again in a few weeks for signs of (new) infestation;
discard any that are infested.

The above steps basically isolate the weevils from their food, or, if
the grain is infested, prevent the infestation from spreading further.

If you must resort to chemicals, there are sprays based on pyrethrins,
a natural insecticide found in chrysanthemums and daisies.  Other local
control agents to consider: spreading diatomaceous earth (messy) in
cabinets (note: not a good idea if you have respiratory problems: dust),
and/or using neem leaves (dried) in storage cabinets to repel insects.

Tom Billings
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