ENCINITAS -- A landscaper died Wednesday after being stung more than 500 times by swarming bees while clearing brush.

Authorities say the man was working with his 20-year-old nephew when his backhoe struck a nest of honeybees on the ground.

The man sought shelter in a nearby shed.

He was covered with bees when fire crews arrived.

The 55-year-old victim, who was allergic to bee stings, went into cardiac arrest, said David Kellum, county entomologist.

Firefighters started CPR and the transported the man to Scripps Encinitas where he was pronounced dead.

His nephew was stung twice, but was expected to be okay, Kellum said.

Kellum said it was not immediately clear what type of bees were involved.

He said about 80 percent of wild bees in San Diego County are Africanized honey bees, also known as killer bees.

They attack quickly and sting in larger numbers than their European honeybee cousins.

“A healthy person can take quite a few stings,” Kellum said.

A healthy 20-year-old old man who weighs 160 pounds could survive at least 1,600 stings, or about 10 stings per pound of body weight.