Blue and green honey makes French beekeepers see red
* Bees have a taste for M&M's candy, beekeepers discover
* Biogas plant says taking corrective action
* Bees face declining mortality rates worldwide
By Patrick Genthon
MULHOUSE, France, Oct 4 (Reuters) - Bees at a cluster of apiaries in northeastern France have been producing honey in mysterious shades of blue and green, alarming their keepers who now believe residue from containers of M&M's candy processed at a nearby biogas plant is the cause.
Since August, beekeepers around the town of Ribeauville in the region of Alsace have seen bees returning to their hives carrying unidentified colourful substances that have turned their honey unnatural shades.
Mystified, the beekeepers embarked on an investigation and discovered that a biogas plant 4 km (2.5 miles) away has been processing waste from a Mars plant producing M&M's, bite-sized candies in bright red, blue, green, yellow and brown shells.
Asked about the issue, Mars had no immediate comment.
The unsellable honey is a new headache for around a dozen affected beekeepers already dealing with high bee mortality rates and dwindling honey supplies following a harsh winter, said Alain Frieh, president of the apiculturists' union.
Agrivalor, the company operating the biogas plant, said it had tried to address the problem after being notified of it by the beekeepers.
"We discovered the problem at the same time they did. We quickly put in place a procedure to stop it," Philippe Meinrad, co-manager of Agrivalor, told Reuters.
He said the company had cleaned its containers and incoming waste would now be stored in a covered hall.
Mars operates a chocolate factory near Strasbourg, around 100 km (62 miles) away from the affected apiaries.
Bee numbers have been rapidly declining around the world in the last few years and the French government has banned a widely used pesticide, Cruiser OSR, that one study has linked to high mortality rates.
France is one of the largest producers of honey within the European Union, producing some 18,330 tonnes annually, according to a recent audit conducted for national farm agency FranceAgriMer.
Ribeauville, situated on a scenic wine route southwest of Strasbourg, is best known for its vineyards. But living aside winemakers are about 2,400 beekeepers in Alsace who tend some 35,000 colonies and produce about 1,000 tonnes of honey per year, according to the region's chamber of agriculture.
As for the M&M's-infused honey, union head Frieh said it might taste like honey, but there the comparison stopped.
"For me, it's not honey. It's not sellable." (Additional reporting and writing By Alexandria Sage; Editing by Catherine Bremer and Paul Casciato)
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