Abstract
Medical aspects on cockroaches based on their specific morphology and ecology were described in this paper.
The cockroache have following specific habits which are thought by people that they are hard to control.
1. They become active and harmful mainly during night, so that it is hard to know their popularion.
2. They can nide and move quickly in small spaces such as crevices of wooden funiture.
3. The female carries egg case in which eggs are safe more than 2 weeks against insecticides.
Our laboratory found new method of control based on above mentioned habits using 5% DDT solution. According to the results of both in the laboratory and fields large number of cockrouches in deep infested places separated by white border line containing 5% DDT painted with paint brush are killed or knock down and are found in the next morning. This method using especially water soluble type of DDT is thought better than other ones in Japanese house and/ or restaurant because it is proved low rate of toxication against people and hood, incombustibility and more economical.
