Abstract:To enhance Bacillus thuringiensis (Bt) efficacy, four Cry toxins were purified from four different Bt strains and assessed in their combined efficacy. The Cry mixtures significantly expanded their target insect spectra. Bacterial culture broth of Xenorhabdus nematophila (Xn) significantly suppressed insect cellular immune response and increased Cry toxicity. The addition of Xn culture broth to Cry mixture significantly enhanced Bt efficacy in target insect spectrum and insecticidal activity.
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