I have screened bottom boards and noticed on the plastic pull out sheet (the one that gets sprayed with Pam oil) a few maybe 3 SHB larva. Most of the sheet was covered in small yellow bits, like crumbs of comb I guess. Is that normal or is that the result of the larva boring and chewing up the comb? I didn't see any actual beetles on the sheet or in the hive during inspection.
Thanks
Titus