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Effect of two commercial formulations of Bacillus thuringienesis subsp. kurstaki on the forest earthworm Dendrobaena octaedra



Effect of two commercial formulations of Bacillus thuringienesis subsp. kurstaki on the forest earthworm Dendrobaena octaedra



Canadian Journal of Forest Research 26(9): 1594-1601



The effects of Dipel 8L and Dipel 8AF (two formulations of Bacillus thuringiensis subsp. kurstaki (B.t.k.)) on the survival, growth, and reproduction of the forest earthworm Dendrobaena octaedra (Sav.) were studied in the laboratory using simple soil-litter microcosms. Dendrobaena octaedra was not adversely affected by an unformulated preparation of B.t.k. or by the aqueous formulation (Dipel 8AF) even at doses representing 1000 times the expected environmental concentration (EEC). However, survival, growth, and cocoon production were significantly reduced in the presence of Dipel 8L at 1000 times EEC, which is the level recommended for Tier I testing for environmental effects according to the Canadian guidelines for registration of naturally occurring microbial pest control agents. Further tests indicated that the toxic component of the Dipel 8L was the oil-based formulation blank. No significant deleterious effects on survival, growth, or reproduction were observed in microcosms sprayed with Dipel8L at the EEC, 10 times EEC, or 100 times EEC. There was no evidence of a synergistic reaction between oil-based formulation ingredients and B.t.k., which would act to increase the susceptibility of D. octaedra to the bacterium.

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Accession: 008550963

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