. By October, 150 of Arp’s hives had been wiped out by mites, 12% of his inventory in just a few months. “My yard is currently filled with stacks of empty bee boxes that used to contain healthy hives,” he says. On top of the threat of pesticides, almond pollination is uniquely demanding for bees because colonies are aroused from winter dormancy about one to two months earlier than is natural. The sheer quantity of hives required far exceeds that of other crops – apples, America’s second-largest pollination crop, use only one-tenth the number of bees. And the bees are...