Seasonal abundance of the Nymphal and Adults stagesof American coakroach Periplaneta Americana L. (Dictyoptera: Blattidae) in Ninevah Governorate

Periplaneta americana L. 1 / / 2004 31 / / 2005. 29.4 2004. 12.1 2004. 12.3 2004. 2.3 2005. 1.3: 1 . . 18.6 2004 2.5 2004. 9.1 2004 2005 1.9 1.2: 1 : .In this study, the population density was evaluated for nymph and adults stages of American Coakroach Periplaneta americana L. in two regions at the city of Mosul, from 1st April, 2004 to 31 March, 2005. At the first region which is bath puplic of an old fashion, the maximum mean number of pepulatiu density was 29.4 individuls at October 2004 and the minimum number was 12.1 individual January 2004 while the highest population density of adult was 12.3 individual during june 2004 while the lowest was 2.3 individual during January.Sex ratio (female:male) was (1.3:1), respectively. The Second region is a puplic bath but of modern fashion. There, the nymph densities range from 18.6 to 2.5 at August 2004 and April 2004, respectively. While adults were 9.1 to 1.9 at October and February, respectively, and the sex ratio was 1.2:1 femal:male.