That is true. I've been dealing with Varroa in the US since I started beekeeping. I've lost many hives because of Varroa. I ran my own experiments treating some

That is true. I've been dealing with Varroa in the US since I started beekeeping. I've lost many hives because of Varroa. I ran my own experiments treating some hives and not treating others, trying to see if nature would allow me to select the strongest (Varroa-resistant) colonies and selectively breed them. I didn't succeed.