Résumé
Cinquante deux souches deB. thuringiensis appartenant à 13 sérovars ont été testées sur des chenilles néonates deSpodoptera frugiperda en contaminant la surface du milieu semi-synthétique d'élevage. Deux souches du sérovarkenyae et une autre du sérovartolworthi provoquent le plus de mortalité, suivies par les souches des sérovarsaizawai etkurstaki. Les souches les moins actives appartiennent aux sérotypesalesti, dendrolimus, sotto etcolmeri. L'action des souches sur le développement larvaire a aussi été abordée. Les souches des sérovarskenyae, aizawai etkurstaki ont ralenti le développement des chenilles, tandis que les souches des sérovarsalesti, sotto etcolmeri n'ont eu aucun effet.
Summary
Fifty-two strains ofBacillus thuringiensis belonging to 13 serovars were tested on neonates of fall armyworm [Spodoptera frugiperda (Smith)] by contamination of the surface of a semisynthetic diet. Two strains ofB. thuringiensis var.kenyae and one ofB. thuringiensis var.tolworthi caused the highest mortality, followed by other strains fromkenyae, aizawai andkurstaki serovars. The less toxic strains belonged to thealesti, dendrolimus, sotto andcolmeri serovars. The sublethal activity of thekenyae, aizawai andkurstaki serovars delayed development of fall armyworm larvae. Thealesti, sotto andcolmeri serovars, however, did not produce this effect.
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Hernandez, J.L.L. Évaluation de la toxicité deBacillus thuringiensis surSpodoptera frugiperda . Entomophaga 33, 163–171 (1988). https://doi.org/10.1007/BF02372651
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DOI: https://doi.org/10.1007/BF02372651