Is Bacillus thuringiensis Berliner effective in controlling Lissachatina fulica (Bowdich)?
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Abstract
Control of the Giant African Snail (GAS), Lissachatina fulica, a highly damaging invasive species. Managing this mollusk is crucial for preserving biodiversity and reducing impacts on public health and agriculture. This study aimed to evaluate the efficacy of two Bacillus thuringiensis strains (LBt-13 and LBt-24), carrying the Cry1Ab protein, in controlling GAS. Two experiments with five strains (including a distilled water control) and ten replicates each were conducted using juvenile snails fed with moringa exposed to different concentrations of B. thuringiensis spores. Snails were kept in terrariums for 30 and 14 days for experiments 1 and 2, respectively, and mortality was monitored. The results showed a complete absence of mortality in all strains, even at high spore concentrations. It is concluded that the B. thuringiensis strains tested, at the doses used, did not demonstrate efficacy in controlling CGA under experimental conditions, ruling out its use as a biocide for this species. The possible inhibition of bacterial growth by the achasin present in the CGA mucus is proposed as a plausible explanation for the lack of effect.
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