The compressed air sprayer, the quart-sized sprayer, the paintbrush, and the bulb duster are the best equipment to use for applying household insecticides. Each type has its pluses and minuses. Careful study of your insect-control problem will help you choose the best equipment for the job.

Compressed Air Sprayer
The water capacity of a compressed air sprayer is usually one to four gallons. Air is pumped into the tank, forcing the spray out when the nozzle is opened. It is ideal for outdoor application of wettable powders and emulsions. Its use indoors is limited if a lot of water is applied with the insecticide. Shake the sprayer frequently when using.

Quart-sized Sprayer
The quart-sized sprayer is also a compressed-air type, but air must be pumped into it continuously while in use. It can be used satisfactorily with emulsions and solutions but not wettable powders. Use it both indoors and outdoors for treating small areas. However, where high pressure is needed, these have limited use.

Paintbrush
Use an inexpensive paintbrush to apply insecticide solutions to baseboards, screens, and similar areas inside buildings. A light film is usually sufficient.

Bulb Duster
This apparatus is used for applying dusts to cracks, crevices, and other voids. The dust is placed into the bulb or bellows; squeezing the device forces the dust out the nozzle and into the void to be treated. A little bit of practice (with plaster of Paris or flour) will help you perfect your dusting technique. Best results are achieved when dusts are applied in a thin, even layer. If you can easily see the dust on a surface, you have used too much.