We have greatly improved our corrugated sheets by having a grid printed on one side directly under where the mites will fall. Now it will be much easier counting the fallen Varroa mites. These sheets can be used over and over by simply cleaning and reapplying Vaseline. Know your mite population any time by doing an unaided 24 hour mite fall.
Please note: These Corex Sheets are included when you buy a new IPM Bottom Board.