Re: Robbing problems
I have found screens to be helpful, particularly with honeybee robbing, but to a less degree with yellow jackets. I am having the worst year for yellow jacket wasps than I've ever encountered. They have totally killed several mating nucs and driven off or killed and taken all the bees from these small nucs. The pressure from the yellow jackets is certainly straining even stronger hives. I have noticed the screens work very well at least initially, but the persistent yellow jackets will also learn how to go to the side entrances.
Beekeeping 13 yrs, 10 Hives - 6a - Engineering Solutions for Honeybee Survival! - WARMBEES.COM