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The town of Wakefield is abuzz over hundreds of dead and dying bumblebees found around St. Joseph's school.The general consensus is they are the victims of pesticides.Watch video reportSome finger-pointing is directed at mosquito control spraying nearby.They are the great pollinators of our fruits, vegetables and plants. But on the sidewalks of Wakefield they appear to have been poisoned."In June, I found a number of dead bees in the hive," said Alexander Bartsch, a beekeeper in Lexington."When it comes to the death of adult bees, the number one cause is pesticides," said Bartsch.Beekeepers across the state say we're losing thousands of bees to pesticides. In Wakefield there was no spraying in the immediate area where the dead bees were found. But last week, about 2 miles away, the East Middlesex Mosquito Control project did spray in residential areas."If they sprayed pesticides 2 to 3 miles away from where the bees died, it's very plausible the bees can go there. We are using pesticides where there is no control," said Dr. Alex Lu of the Harvard School of Public Health.But David Henley of the East Middlesex Mosquito Control Project said there is no connection."The East Middlesex mosquito project has never been accused of killing a bees or a beehive," said Henley."We are following instructions to prevent bee mortality by spraying at night when bees are inactive and in their hives," he said.A more likely culprit, he said, is the happy home owner."There are people out there spraying for turf, for lawn care, and for tree spraying. That could have caused it," said Henley."When you spray with pesticides, they are not only lethal to what you are trying to get rid of in your lawn or your trees, but they will kill bees," said Bartsch.Environmentalists say a balance can be struck to protect both public health and the bee population. Spray pesticides only late at night, and only to prevent mosquito-borne illnesses.