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1 February 2011 Enhanced Toxicity of Bacillus thuringiensis Subspecies kurstaki and aizawai to Black Cutworm Larvae (Lepidoptera: Noctuidae) with Bacillus sp. NFD2 and Pseudomonas sp. FNFD1
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Abstract

Bacillus thuringiensis subspecies kurstaki and aizawai are important control agents for lepidopteran pests. Bioassays were designed to test B. t. kurstaki and aizawai against second- and-fourth instar black cutworm larvae with and without Bacillus sp. NFD2 and Pseudomonas sp. FNFD1 bacteria. B. thuringiensis subsp. aizawai (XenTari) was more toxic to both second- and fourth-instar black cutworm, Agrolis ipsilon (Hufnagel) (Lepidoptera: Noctuidae), larvae than B. t. kurstaki (DiPel) at 7 d after treatment (DAT). When DiPel was combined with NFD2 or FNFD1 versus second instars, the LC50s were 5.0× and 4.7× lower, respectively, than with DiPel alone. DiPel combined with both NFD2 and FNFD1 versus second instars resulted in an LC50 value 7.7× lower than with DiPel alone. When XenTari was combined with NFD2 or FNFD1 versus second instars, the LC50s were 5.2× and 3.8× lower, respectively, than with XenTari alone. XenTari combined with both NFD2 and FNFD1 versus second instars resulted in an LC50 9.7× lower than with XenTari alone. When DiPel was combined with NFD2 or FNFD1 versus fourth instars, the LC50s were 4.4× and 3.4× lower, respectively, than with DiPel alone. DiPel combined with both NFD2 and FNFD1 versus fourth instars resulted in an LC50 5.0× lower than with DiPel alone. When XenTari was combined with NFD2 or FNFD1 versus fourth instars, the LC50s were 5.7× and 3.3× lower, respectively, than with XenTari alone. XenTari combined with both NFD2 and FNFD1 versus fourth instars resulted in an LC50 6.7× lower than with XenTari alone.

© 2011 Entomological Society of America
Tamer A. Mashtoly, Assem Abolmaaty, Mohamed El-Said El-Zemaity, Mohamed I. Hussien, and Steven R. Alm "Enhanced Toxicity of Bacillus thuringiensis Subspecies kurstaki and aizawai to Black Cutworm Larvae (Lepidoptera: Noctuidae) with Bacillus sp. NFD2 and Pseudomonas sp. FNFD1," Journal of Economic Entomology 104(1), 41-46, (1 February 2011). https://doi.org/10.1603/EC10210
Received: 3 June 2010; Accepted: 1 August 2010; Published: 1 February 2011
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