KouassiLorenzettiGuertinEtAl2001

Référence

Kouassi, K.C., Lorenzetti, F., Guertin, C., Cabana, J. and Mauffette, Y. (2001) Variation in the susceptibility of the forest tent caterpillar (Lepidoptera: Lasiocampidae) to Bacillus thuringiensis variety kurstaki HD-1: Effect of the host plant. Journal of Economic Entomology, 94(5):1135-1141.

Résumé

Host-mediated effect on the efficacy of Bacillus thuringiensis Berliner against larvae of the forest tent caterpillar, Malacosoma disstria Hu?bner, was investigated under controlled conditions. Host plants used in this study were quaking aspen, Populus tremuloides Michx., a preferred host, and sugar maple, Acer saccharum Marsh., a secondary host. Larvae were reared in the laboratory on leaves of these hosts, and upon reaching the third, fourth, and fifth instar, they were fed leaves treated with one of a range of concentrations of B. thuringiensis variety kurstaki HD-1 suspensions. Larvae were tested on the host on which they were feeding before the 4-d bioassays. The estimated LC50s were 100-fold greater on quaking aspen than on sugar maple. Also, there was a decrease in efficacy over the whole ranges of concentrations with larval age on both hosts. LC50s varied approximately two-fold between third and fifth instar. These results indicate that host-mediated effects on B. thuringiensis efficacy warrant more interest. In particular, they strongly indicate that the host plant modifies the interaction between B. thuringiensis and a target insect, and offer the opportunity to investigate the mechanism(s) that may be involved in the enhancement of B. thuringiensis toxicity. © 2001 Entomological Society of America.

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@ARTICLE { KouassiLorenzettiGuertinEtAl2001,
    AUTHOR = { Kouassi, K.C. and Lorenzetti, F. and Guertin, C. and Cabana, J. and Mauffette, Y. },
    TITLE = { Variation in the susceptibility of the forest tent caterpillar (Lepidoptera: Lasiocampidae) to Bacillus thuringiensis variety kurstaki HD-1: Effect of the host plant },
    JOURNAL = { Journal of Economic Entomology },
    YEAR = { 2001 },
    VOLUME = { 94 },
    PAGES = { 1135-1141 },
    NUMBER = { 5 },
    ABSTRACT = { Host-mediated effect on the efficacy of Bacillus thuringiensis Berliner against larvae of the forest tent caterpillar, Malacosoma disstria Hu?bner, was investigated under controlled conditions. Host plants used in this study were quaking aspen, Populus tremuloides Michx., a preferred host, and sugar maple, Acer saccharum Marsh., a secondary host. Larvae were reared in the laboratory on leaves of these hosts, and upon reaching the third, fourth, and fifth instar, they were fed leaves treated with one of a range of concentrations of B. thuringiensis variety kurstaki HD-1 suspensions. Larvae were tested on the host on which they were feeding before the 4-d bioassays. The estimated LC50s were 100-fold greater on quaking aspen than on sugar maple. Also, there was a decrease in efficacy over the whole ranges of concentrations with larval age on both hosts. LC50s varied approximately two-fold between third and fifth instar. These results indicate that host-mediated effects on B. thuringiensis efficacy warrant more interest. In particular, they strongly indicate that the host plant modifies the interaction between B. thuringiensis and a target insect, and offer the opportunity to investigate the mechanism(s) that may be involved in the enhancement of B. thuringiensis toxicity. © 2001 Entomological Society of America. },
    KEYWORDS = { Bacillus thuringiensis Host plant-mediated effect LC50 Malacosoma disstria Quaking aspen Sugar maple },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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