Efficiency of the bacteria Bacillus thuringiensis isolate from different local soil as bio insecticides on different insects in Iraq

Abstract

Soil survey was conducted during the years 2005 and 2006 for seven Iraqi Governorate representing different climatic and soil stricter for the presence of Bacillus thuringiensis . The results indicated that the best isolation method was the inhibitor with thermal treatment 51.2% of total presence bacterial. The total average of bacterial presence is representing Iraqi soil was 34.5%. The highest presence of bacteria was 50% for Diala and Baghdad. Mortality eate of the bioassay isolation test showed higher 56.7% for Anbar , Baghdad for Tribolium confusum concentration 1.2 x 106 spor / ml. The result of bioassay of Bacillus thuringiensis isolates against Culex pipiems showed mortality 96.9% in Sulimaiyah and Anbar with 1.2 x 105 spor / ml concentration . The bioassay isolates testing spodoptera littoralis showed mortality rate of 96.6% in Diala and Anbar with 1.2 x 106 spore / ml.