when you say a varroa screen I assume you mean a screened bottom board
I think window screen might be to small
I got #8 hardware cloth (1/8" holes) at ACE hardware
you can buy it by the foot pretty cheap
no it won't. It's too fine and the varroa won't go through it. The purpose of the screen is the mites fall down, get trapped under the screen and the bees are above the screen. The mites lay there waiting for a host but the bees can't get under there so the mites die. The screening to use is hardware cloth # 8 size ( or 8x8 ) Good luck
A forum community dedicated to beekeeping, bee owners and enthusiasts. Come join the discussion about breeding, honey production, health, behavior, hives, housing, adopting, care, classifieds, and more!