Molluscicidal property of symbiotic bacteria associated with entomopathogenic nematodes against and , the intermediate hosts of trematode parasites.

and act as intermediate hosts for veterinary and medical trematode parasites. Snail control is a strategy used to decrease the number of snails and interrupt the life cycle of parasites. The objective of this study was to evaluate the efficacy of and extracts against and in the laboratory. Ethyl acetate extracts of selected symbiotic bacteria were tested for their molluscicidal activities according to World Health Organization guidelines. Additionally, pathological changes in the snails were observed after treatment with the LC50 values under a light microscope. and were susceptible to all ethyl acetate extracts of symbiotic bacteria. The lowest LC50 and LC90 at 24 h for after exposure to subsp. (bALN18.2_TH) extracts were 81.66 and 151.02 ppm, respectively. Similarly, the lowest LC50 and LC90 at 24 h for after exposure to subsp. (bAPY3.5_TH) extracts were 49.21 and 147.66 ppm, respectively. species had more substantial molluscicidal effects than on these snails. The ethyl acetate extracts of these bacteria are effective when contacting the epithelial cells and foot muscle of the snails. To our knowledge, this is the first report on using and extracts to evaluate molluscicidal activities. These symbiotic bacteria, and may be useful for controlling snail intermediate hosts.