Bioassay of two pesticides on Bulinus truncatus snails with emphasis on some biological and histological parameters

Potential role of rice cultivation and fish aquaculture in the transmission of schistosomiasis and the effect of pesticides and fertilizers used in rice cultivation on the snail Biomphalaria alexandrina and schistosome larval stages

“…These findings agree with the present results explored that machete was the most potent against snail eggs as LC 25 , LC 50 and LC 90 concentrations were5.10, 14.80 & 33.20 ppm which killed 94.2 -100% eggs, with hatchability failure (0 -4.3%). This is confirmed by, Ibrahim et al (1992) who reported that exposure of B. alexandrina to sublethal concentrations (0.125, 0.25 and 0.05 ppm) of the organ phosphorus insecticide, chlorpyrifos (Dursban), induced a reduction in egg production and egg hatchability, while Hasheesh et al (2011) reported that the high concentrations of the three tested agents Difenoconazole (Score), the plants Asparagus densiflours and Oreopanax guatemalensis caused a remarkable reduction in hatchability percent of B. alexandrina eggs than the low concentrations.…”

“…Also, El-Emam et al (2008) showed that 0.12 ppm of Match pesticide killed miracidia after 120 minutes while killed cercariae after 90 minutes. Hasheesh and Mohamed (2011) evaluate the larvicidal activity of two pesticides (Chlorpyrifos and Profenophos) and observed that the mortality rates of miracidia and cercariae were elevated gradually by increasing the concentration of the tested pesticides.…”

“…Each replicate of 100 cercariae or miracidia were exposed to 10 ml of LC 5 , LC 10 and LC 25 as assessed against snails. Ten ml of declorinated water containing 100 cercariae or miracidia were used as control (Hasheesh and Mohamed, 2011). The mortality was determined at different time intervals; 3/4, 1, 2, 3 & 4 h, then a percentage of cumulative mortality of miracidia and cercariae were determined.…”

Toxicological effects and oxidative stress responses in freshwater snail, Lanistes carinatus, following exposure to chlorpyrifos

“…The data of the present study are consistent with that of the other studies. The 24-h LC 50 for the intermediate host snail Bulinus truncates was 1.32 μg L À 1 (Hasheesh and Mohamed, 2011). However, Odenkirchen and Eisler (1988) reported that L. carinatus snail was not affected by chlorpyrifos.…”

Impact profenophos (pesticide) on infectivity of <i>Biomphalaria alexandrina</i> snails with <i>schistosoma mansoni</i> miracidiaand on their physiological parameters

“…As example of these is the agricultural insecticides which may interfere in the life, reproduction and infection of snail vectors of schistosomiasis when they reach water bodies [7]. Many authors studied the effect of agricultural pesticides that may reach water courses as residues on different biological parameters of snail vectors of schistosomiasis [8].…”