Synergism between Bacillus thuringiensis spores and toxins against resistant and susceptible diamondback moths (Plutella xylostella)

Article Abstract:

Research was conducted to examine the synergism between Bacillus thuringiensis spores and toxins against resistant and susceptible diamondback moths, Plutella xylostella. Results demonstrate that B thuringiensis toxins combined with spores can be toxic despite the fact that the toxins and spores possessed little or no independent toxicity. Findings also indicate that the extent of synergism between toxins and spores of B thuringiensis varies according to insect strain, spore type, the set of toxins, the concentration of toxins and spores and other materials.

Spores (Bacteria), Bacterial spores, Diamond-back moth, Diamondback moths

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Variation in susceptibility to Bacillus thuringiensis toxins among unselected strains of Plutella xylostella

Article Abstract:

Strains of the diamondback moth Plutella xylostella have different sensitivities to the Cry toxins of Bacillus thuringiensis depending on what part of the world they come from. Strains from England, Hawaii, and the Netherlands had different sensitivities but in all three, Cry1Ab and Cry1Ac were the most toxic and Cry1Da the least toxic.

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Regulation of the packaging of Bacillus thuringiensis delta-endotoxins into inclusions

Article Abstract:

Differences in packaging of the delta-endotoxins of Bacillus thuringiensis may account for the fact that the Cry1Da1 endotoxin is present in much smaller amounts in inclusions than the other endotoxins. The inclusions are ingested by susceptible insect larva and the protoxins are metabolized to toxins.

Endotoxins

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