Susceptibility of Biomphalaria alexandrina to the plant Azolla pinnata and some herbicides in relation to infection with Schistosoma mansoni miracidia.
Molluscicidal activity of the herebicides 2,4-D and Graminol, as well as both extracts and dry powder of the plant Azolla pinnata were evaluated against B. alexandrina snails. It was observed that 2,4-D proved to be the most toxic compound among he tested ones, showing LC90 of 52 ppm after 24 h of exposure. Ethanol extract of Azolla showed the highest molluscicidal activity against the tested snails compared with the other extracts and dry powder (LC90 = 3300 ppm). Ethanol extract at 6600 ppm after 3 h of exposure killed 100% and 19.4% of S. mansoni miracidia and cercariae, respectively. The molluscicidal activity of 2,4-D was not influenced by the presence of Azolla (900 plants/liter) for 7 days, while Graminol effect was significantly reduced. However, the infectivity of S. mansoni miracidia to B. alexandrina snails was not affected by Azolla existence.
Zidan
Z H
ZH
Faculty of Agriculture, Ain Shams University, Cairo, Egypt.
Hafez
A M
AM
Abdel-Megeed
M I
MI
el-Emam
M A
MA
Ragab
F M
FM
el-Deeb
F A
FA
D000818:Animals; D001700:Biomphalaria / Q000469:parasitology*; D006540:Herbicides; D006790:Host-Parasite Interactions; D008975:Molluscacides; D010936:Plant Extracts; D012550:Schistosoma mansoni / Q000254:growth & development / Q000502:physiology*; D012555:Schistosomiasis mansoni / Q000517:prevention & control
D006540:Herbicides; D008975:Molluscacides; D010936:Plant Extracts