| age-dependent susceptibilities of bulinus truncatus snails to an aqueous extract of pulicaria crispa (forssk.) oliv. (asteraceae) leaves. | this study was carried out to investigate the potential use of the herb pulicaria crispa in the biological control of different developmental stages of bulinus truncatus, a major snail intermediate host of urinary schistosomiasis. age-dependent susceptibilities of mature adult snails, immature snails, juveniles, and one-day old egg masses to aqueous extracts of pulicaria crispa leaves collected from khartoum (sudan) and riyadh (saudi arabia) was determined and compared. the results show the juve ... | 2009 | 19842431 |