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Abstract

The followingdilution 5×10-1, 10-1,10־2, 10-3gm/L for the indigenous isolateofBacillusthuringiensisbacteria and the commercially isalate were used for experiments against the different stagesof fig moth of E.cautellawhich exposed by filter papermethod.The results showed thatmortality of larval stageswas increased with the increasing concentrationof the biocide,in addition to increasein the mortality of the larval stages reached to thehighestpercentagein the third days of treatment of the larvalstage in comparison with the first and second days of exposure. The results also showed that thesensitivity of larval stages wasincreasedin first and second instars while reducedin the last instars .The high percentage of first instar mortality for the indigenous isolate in the concentration of 5×10-2was 72.8% , while the low percentage of mortality showed in the concentration of 5×10-2for the fifth instar larvae which was 13.3% in third days of treatment while a highpercentage of mortality was showed for the first instar larvae for the commercially isulate in the concentration of 5×10-2was 59.4% Furthermore, low percentage of mortality was shown in the concentration of 5×10-2in fifth instar larval which was 8.3% in the third days of treatment. The results also showed that the indigenous isolated was more effective than the commercially produced bacteria for killing larval instars of fig moth E.cautella.The total percentage of larval instar mortality reached to 44.5%after the third days of treatment in concentration 5×10-2in the indigenous isolate , and it was 99.8%in the commercially produced bacteria

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