Our plant has been having flour beetles issue for a month now.
We think this problem may have been introduced from our vendor originally, as we buy a lot of different materials from other suppliers to repack in addition to milling our own flour. We have checked our own production lines many times and have found no evidence of pest activity. We have also sifted many of our own flour and found no larva/beetle.
But anyway, now flour beetle has become a serious problem for our entire facility. We continued to find a few bugs sporadically on different products pallets in our warehouse. Then we thoroughly inspected every item in the warehouse twice. We discarded all infested products, froze the products that may have been affected (We don't have freezer in our facility, We can only send one truckload at a time to a nearby contractor who can freeze it for us). Also, we thought we found the source that infested severely and disposed of them.
However, after that, we keep finding more beetles on different products (outside of bag/tote), and some items we have inspected previously still got severely infestation later.
Our facility is clean and every operator keeps an eye on flour beetle since we got this issue. The pest control contractor couldn't find any concerned spot during the inspection. He also said there was no other measure that could be implemented, such as fumigation, because we are an organic plant.
I wonder if it is possible to perform any other large scale treatment. We really need to find a way to solve this issue once and for all.
Any suggestions on how to deal with the issue?
Thank you!