PROBLEM TO BE SOLVED: To provide a pest-controlling composition exhibiting excellent controlling effects with smaller dosage while utilizing Bacillus thuringiensis (BT bacterium).SOLUTION: Synergistic effects extremely exceeding additive effects are achieved by using (A) the BT bacteria having insecticidal activity in combination with (B) an insect-pathogenic filamentous bacterium (a bacterium of the genus Beauveria such as Beauveria bassiana and B. brongniartii a bacterium of the genus Verticillium such as Verticillium lecanii, and a bacterium of the genus Paecilomyces such as Paecilomyces fumosoroseus). As a result, the control of the pest is efficiently carried out with the small dosage.COPYRIGHT: (C)2010,JPO&INPIT【課題】本発明は、Bacillus thuringiensis(BT菌)を利用しながら、より低薬量にて優れた防除効果を有する有害生物防除剤の開発を目的とする。【解決手段】A成分:殺虫活性を有するBT菌、及びB成分:昆虫病原性糸状菌(Beauveria bassiana、B.brongniartii等のボーベリア属菌;Verticillium lecanii等のバーティシリウム属菌:Paecilomyces fumosoroseus等のペキロマイセス属菌の少なくともひとつ)を併用することにより、相加効果をはるかに超えた相乗効果が奏される。もって、少量の施用量にて有害生物の防除が効率的に行われる。【選択図】なし
