(A) The Bel protein at different concentrations enhances Cry1Ac protein (3 μg/ml) toxicity toward H. armigera in diet incorporation method bioassays. The Cry1Ac protein was mixed with purified Bel at Bel:Cry1Ac ratios of 0:30, 1:30, 2:30, 3:30, 4:30, 6:30, and 8:30. (B) The Bel protein enhances Cry1Ac protein toxicity toward H. armigera in diet incorporation method bioassays. The Cry1Ac protein was mixed with purified Bel at Bel:Cry1Ac ratios of 1:0, 1:15, 1:30, and 1:60. Control treatments included the Cry1Ac protein at different concentrations. The figure indicates that the mortality with the Cry1Ac protein plus Bel protein treatment showed significant differences from that with the Cry1Ac treatment alone at the same Cry1Ac dosage.