The control under fleas has two aspects.
One of them it is flea control in wild nature in different region of Asia, Africa, South and North Amerca. The fleas are the important vectors of plague and for example the big network of antiplague stations there are in a territory of the former Soviet Union.
Another aspect of the flea control is connected with protection of pets. The information about any pesticides and treatments you may find on Web-sites of various companies.