Less than a year after France’s decimated bee populations showed signs of recovery, beekeepers here are once again in a panic as their income-generating worker drones are disappearing by the tens of millions.
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% of some hives missing in action.
”We don’t know what is going on, and we are calling everything into question,” says beekeeper and honey producer Franck Aletru, whose 2 200 hives are in the Vendee region in western France.
Worries have extended across Europe, where 30% of bee species are threatened by a combination of factors that is still poorly understood, says 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 says.
Devastation
The apiculture industry in the United States — and dozens of agricultural crops, from almonds to apples and 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 â,¬100-million 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%, 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,” says Aletru.
But last winter, bee populations in France only shed about 10% 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,” says Vaissiere. ”They were in the pollen and the nectar — I don’t see how the pollinating bees could have failed to ingest them.”
Contributing factors
But 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 US 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 weaken 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 south-western France, and could eventually colonise much of the Mediterranean coastal area, experts say.
”Thirty-five percent of the world’s vegetal food resources depend on bees for pollination — we cannot ignore this problem,” says Beatrice Robrolle-Marcy, president of the association Bee Planet. — AFP
