Comparison of effects of several insecticides to housefly and German cockroach estimated by spray and contact methods

Abstract

The comparative KT-50 values of DDVP 0.5%, pyrethrin 0.1%, diazinon 0.5%, lindane 0.5%, tech. DDT 5.0%, dieldrin 0.5%, and chlordane 0.5% (W/V) kerosene solutions were estimated in spray method and contact method against adults of the housefly, Musca vicina Macquart, and the German cockroach, Blattella germanica Linne. The quick knockdown effects of chemicals detected from KT-50 values were demonstrated in the following order : 1) Against housefly in spray method : DDVP≒pyrethrin>tech. DDT>diazinon>lindane>dieldrin>chlordane 2) Against German cockroach in spray method : pyrethrin>DDVP>lindane>tech. DDT>diazinon>dieldrin>chlordane 3) Against housefly in contact method : DDVP>pyrethrin>diazinon>lindane>dieldrin>chlordane>tech. DDT 4) Against German cockroach in contact method : DDVP≒lindane>diazinon>pyrethrin≒dieldrin>chlordane>tech. DDT The more effective chemicals against housefly than against German cockroach followed in the order : 1) In spray method : tech. DDT>DDVP>diazinon≒dieldrin>lindane>chlordane>pyethrin 2) In contact method : pyrethrin>DDVP>dieldrin≒chlordane>tech. DDT>diazinon>lindane The chemicals showed the remakable difference between in spray method and in contact method were 1) Against housefly : a) Chemicals more effective in spray method; pyrethrin, tech. DDT b) Chemicals more effective in contact method; chlordane, dieldrin 2) Against German cockroach : a) Chemicals more effective in spray method; phrethrin, tech. DDT