We recently placed 20,000 of the critters on the left into apple trees throughout the orchard. They are called persimmilis. In hot weather mites like the one on the right will suck dry the leaves and fruit, killing the tree if left unchecked. Rather than use chemicals, we rely on the persimmilis to hunt out and eat the 'bad' mites. Both breed up at an incredible rate, but since persimmilis can eat two mites and five mite eggs a day they usually keep the mite population to a level at which damage is minimal.
During the fires in October, Tim relocated his bees from our apiary, situated on the edge of the burn. The bees are unharmed, but Tim lost an apiary further west. We expect that the bees won't be back until Spring 2014 for apple pollination time.