There are several methods to kill bees, but the most efficient way is to destroy their nest by physically removing it or by applying insecticide directly to it. If the nest is in the ground, pour laundry detergent or soap and water into it. A more direct approach is to put garlic powder on the bees. Bees attempt to avoid garlic because it produces a fatal effect.
Dinotefuran is a furanicotinyl insecticide that kills bumblebees and other insects. The product is the third generation of the neonicotinoid group created by Mitsui Chemicals. When using an insecticide, consider dust contrary to the liquid version because it can penetrate the entire nest.
Insecticide solutions contain boric acid or chlorpyrifos. Boric acid is the safest to use, but it takes longer to work than the other active ingredient options. Soap water or laundry detergent can kill bumblebees that nest in the ground when the solution is poured into the nest opening.
When killing bees, or attempting to destroy their nest, protect against accidental stings and injuries by wearing the appropriate clothing. Protective gear, such as a long-sleeved shirt with the cuffs taped to gloves and pants with cuffs taped to the socks, are highly recommended to protect against injuries.