The banning in 2005 of two potent pesticides used on sunflower and corn crops, suspected of killing off the bees, appeared to have stemmed the massive die offs and reversed nearly a decade of declining honey harvests.

But end-of-winter mortality rates have shot up once again, with up to 60 percent of some hives missing in action.

"We don't know what is going on, and we are calling everything into question," said beekeeper and honey producer Franck Aletru, whose 2200 hives are in the Vendee region in western France.

Worries have extended across Europe, where 30 percent of bee species are threatened by an as yet poorly understood combination of factors, said Bernard Vaissiere of France's national agricultural research institute.

There are more than 1,000 bee species in France, including the domesticated honey-producing variety, and about 20,000 worldwide, he said.

The apiculture industry in the United States -- and dozens of agricultural crops, from almonds to apples to avocados, that depend of bees for pollination -- has also been devastated, though experts say the reasons, while related, may not be exactly the same.

In France, honey production in the 100 million-euro (150 million-dollar) apiculture sector dropped by half over a nine-year period to 18,000 tonnes in 2007, according to agriculture ministry statistics.

Average income for the sector's 75,000 beekeepers has dropped by 65 percent, forcing many to take on second jobs just to make ends meet.

"One of my fellow apiculturists committed suicide, and families have been torn apart," said Aletru.

But last winter, bee populations in France only shed about 10 percent of their numbers -- a normal seasonal loss.

Many scientists, and most beekeepers, attributed the first good news in a decade of decline to the banning of Regent and Gaucho, two pesticides thought to enter the hives through the pollen collected by the bees, especially from France's ubiquitous sunflowers.

The manufacturers, German chemical giants BASF and Bayer, have denied that their products are toxic for humans or bees.

"It is difficult to imagine that these insecticides had no impact," said Vaissiere. "They were in the pollen and the nectar -- I don't see how the pollinating bees could have failed to ingest them."

But a nest of other factors, experts say, have also contributed to colony collapse disorder: reduced biodiversity stemming from monoculture farming, bacterial parasites such as Varroa destructor and Nosema ceranae, and a deadly pathogen called Israeli Acute Paralysis Virus (IAPV).

IAPV has struck the United States as well, and is thought to have originated in bees imported from Australia to repopulate hives, and from royal jelly, a honey-derived product manufactured in China.

Another parasite, the varroa mite, may weakens bee immune systems to the point that they become vulnerable to these diseases, experts say.

The most recent threat to bees is the Asian hornet, Vespa velutina, which probably arrived in southern France in a shipment of pottery sometime in 2004.

The hornet, which preys on honey bees, has already spread through much of southwestern France, and could eventually colonise much of the Mediterranean coastal area, experts say.

"Thirty-five percent of the worlds vegetal food resources depend on bees for pollination -- we cannot ignore this problem," said Beatrice Robrolle-Marcy, president of the association Bee Planet.

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