Unless someone or something stops it soon, the mysterious killer that is wiping out many of the US' honeybees could have a devastating effect on the country's dinner plate, perhaps even reducing its people to a glorified bread-and-water diet.
Honeybees do not just make honey; they pollinate more than 90 of the tastiest flowering crops the country has.
Among them: apples, nuts, avocados, soybeans, asparagus, broccoli, celery, squash and cucumbers. And lots of the really sweet and tart stuff, too, including citrus fruit, peaches, kiwi, cherries, blueberries, cranberries, strawberries, cantaloupe and other melons.
In fact, about one-third of the human diet comes from insect-pollinated plants, and the honeybee is responsible for 80 percent of that pollination, according to the US Department of Agriculture.
Even cattle, which feed on alfalfa, depend on bees. So if the collapse worsens, Americans could end up being "stuck with grains and water," said Kevin Hackett, the national program leader for USDA's bee and pollination program.
"This is the biggest general threat to our food supply," Hackett said.
While not all scientists foresee a food crisis, noting that large-scale bee die-offs have happened before, this one seems particularly baffling and alarming.
US beekeepers in the past few months have lost one-quarter of their colonies -- or about five times the normal winter losses -- because of what scientists have dubbed Colony Collapse Disorder. The problem started in November and seems to have spread to 27 states, with similar collapses reported in Brazil, Canada and parts of Europe.
Scientists are struggling to figure out what is killing the honeybees, and early results of a key study this week point to some kind of disease or parasite.
Even before this disorder struck, the US' honeybees were in trouble. Their numbers were steadily shrinking, because their genes do not equip them to fight poisons and disease very well, and because their gregarious nature exposes them to ailments that afflict thousands of their close cousins.
"Quite frankly, the question is whether the bees can weather this perfect storm," Hackett said. "Do they have the resilience to bounce back? We'll know probably by the end of the summer."
Experts from Brazil and Europe have joined in the detective work at USDA's bee lab in suburban Washington. In recent weeks, Hackett briefed Vice President Dick Cheney's office on the problem. Congress has held hearings on the matter.
"This crisis threatens to wipe out production of crops dependent on bees for pollination," Agriculture Secretary Mike Johanns said in a statement.
A congressional study said honeybees add about US$15 billion a year in value to the US food supply.
Of the 17,000 species of bees that scientists know about, "honeybees are, for many reasons, the pollinator of choice for most North American crops," a National Academy of Sciences study said last year. They pollinate many types of plants, repeatedly visit the same plant, and recruit other honeybees to visit, too.
Pulitzer Prize-winning insect biologist E.O. Wilson of Harvard said the honeybee is nature's "workhorse -- and we took it for granted."
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