"Saw toothed grain Beetles" New one on me! It seems a friend of mine has recently had quite a bit of problems with these varmints.... They came in with bags of rice and beans, purchased from "Costco". Now one entire bedroom is inundated with the beetles and he has to have an exterminator come and clean out the place. They literally ruined/destroyed bags of rice and beans he had stored inside a bedroom. Unless you can freeze the grains for some 24 hours or more ( ? ) and then re-package them into airtight containers, or, use nitrogen and flood the grains, inside say a plastic (food grade) 5 gallon bucket..... Then there is certainly going to be a lot of these problems in the future. I have read where some advocate the use of a piece of dry ice in the bottom of a plastic bucket, then pouring the grains on top. I can see where the cold would be ok, but not sufficient to kill all the pests. Also, the CO2 released, would not be a deterrent to most of the bugs! Now these pests/beetles come in with the grains themselves, and propogate rapidly...they eat thru the plastic bags the grains come in and spread all over the place. I have had the same problem with dry cat food in the large plastic bags for the past several months. I take and dump the cat food into a large gray plastic garbage basket, but it just keeps them contained in there. They do a LOT of damage, quickly! When I scoop out cat food, out comes the larvae and some fully "morphed" adult beetles! It's a mess!