BLACK BEETLES LIKE INSECT EATING UP MY CROP...PLEASE HELP

hello friends..
For the past 2-3 days i have been seeing my corp eating up by white necked black beetles...i am really worried of loosing my crop which was as many as 75 kg of dry substrate....
I put dense smoke in the whole room but couldnt get rid of them...they are eating up all the small fruit bodies which are coming up ....

friends please suggest me any pesticide or something like that to get rid of them.... HELP ME .....HELP ME....!!!

Sprinkle diatomatous earth or DE on it and it kills any bugs as it gets between their shells and cuts them to death. Its also edible for human and good for us..

http://en.wikipedia.org/wiki/Diatomaceous_earth

THANKS friend...
actually they are plastic bag beds.... and these beetles are eating them up (the fruiting bodies) from underneath..
and this is an actual concern for me.... can DE be used with water and sprayed inside the room on the bed ....?
or is there any other solution...?

yes add the DE to water and water them.. it still keeps its shape and cuts them up. also sprinkle it everwhere they go and next time add it to your bag mixture