The best time to exterminate bees is at dusk, said two pest-busters that The New Paper spoke to.
Mr Carl Baptista, a former pest control technician and now director of Origin Exterminators, said that doing so in the day is hazardous as it is when bees forage for food.
The bees are outside their hives and can easily notice human activity around their abode, stinging anyone who poses a threat.
Mr Baptista, 38, said: "Sadly, most clients are unaware of this.
"They often request for an immediate extermination lest the bees pose a threat to the public, regardless of the time of the day.
"What they do not realise however, is that the pest control worker's life may in turn be endangered."
Mr Nor Afendi Shan Min, senior manager for operations at PestBusters, agreed with Mr Baptista.
He said that there is "definitely a lot less risk of being attacked by the bees", in the evening or at night.
Around noon on Nov 6, pest controller Mr Mohd Sallehen, in his 30s, was attacked by a swarm from a beehive he was planning to remove at Sherwood Road in Tanglin. He was stung before he could get his protective gear on, and later died.
It is not clear if his was the first bee-attack death here.
A National University Hospital spokesman said Mr Sallehen's death could be due to anaphylaxis, an allergic reaction to bee venom. Bee stings release pheromones, a chemical that attracts other bees, which can compound an attack.
But hornets are more dangerous than bees because they can sting multiple times.