Ken, They are easy to DIY. Just cut a piece of #8 hardware cloth the OD size of a large mouth jar ring, place the cloth between the two ring and seal the outside edges with two part epoxy. Make sure the the rings are lined up before the epoxy hardens. Also be sure to check out this article before treating your bees. honeybeehealthcoalition.org/varroa/
Do you know where we can purchase the screened lids for the plastic jars?
Ken, They are easy to DIY. Just cut a piece of #8 hardware cloth the OD size of a large mouth jar ring, place the cloth between the two ring and seal the outside edges with two part epoxy. Make sure the the rings are lined up before the epoxy hardens. Also be sure to check out this article before treating your bees. honeybeehealthcoalition.org/varroa/