Bioefficiency of Aerosol Insecticide Products against Cockroaches

Abstract

Bioefficiency tested of aerosol insecticide products against cockroarches in Thailand has been carried out during January, 2006 - December, 2010 by National Institute of Health, Department of Medical Sciences. German cockroaches (Blattella germanica) were used to assess the quality by contacting poison test. In all, 233 chemical product samples were investigated, 79.4 percent of the samples met the criteria with the 95 percent knockdown time (KT95) varied from less than 1 to 25 minutes. The major active ingredient was pyrethroid (95.3%) and the most commonly employed was imiprothrin (54.9%). Active ingredients were mixed ranging from 1 to 4 chemical compounds in the products, in order to increase more killing action, yet indicating no additional efficiencies. The most effective formula had chemical compounds cyphenothrin (0.10 - 0.17 % w/w) and imiprothrin (0.02 - 0.20 % w/w), which were able to paralyse cockroaches within 10 minutes and killed all of the tested cockroaches within a given time.