EVALUATION OF THE PLANT PESTICIDES VERTIMEC AND MATCH AGAINST BIOMPHALARIA ALEXANDRINA, THE SNAIL VECTOR OF SCHISTOSOMA MANSONI | ||||
| Journal of Biological Chemistry and Environmental Sciences | ||||
| Volume 3, Issue 1, March 2008, Page 883-898 PDF (273.59 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/bces.2008.426875 | ||||
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| Abstract | ||||
| The molluscicidal activity of seven pesticides, commonly used as plant pesticides has been evaluated against adult Biomphalaria alexandrina snails. The tested pesticides are Basudin, Cidal, Imidor, Neomyl, Selecron, Match and Vertimec. The results showed that Match and Vertimec were the most toxic ones with LC90 values of 0.46 and 0.18 ppm, respectively after 24 hrs exposure. Therefore, they were evaluated against the hatchability of snail's eggs, snail's growth, and snail's fecundity; moreover, against Schistosoma mansoni miracidia and cercariae. It was noticed that the snails could not survive more than 2 weeks of continuous exposure to LC25 of Vertimec with a highly significant reduction in their reproductive rate 80.7% in comparison with control group. However, few snails survived 4 weeks of continuous exposure to LC25 of Match , their Lx was 0.3 (30% survival rate) under these conditions, the reduction in snail's reproduction rate was significantly high, being 53.8%.The hatchability of snail's eggs (of 1, 3 and 7 days old) was slightly suppressed by their exposure for 24 hrs to LC of Match or90 Vertimec , being 88.5% and 63.5%, respectively for eggs of 7 days old. Moreover, increasing the concentration of these pesticides to 2 LC90 caused more suppressive effect on egg's hatchability to be 55.2% and 52.5% respectively, compared to 95.4% for control eggs. There are no obvious changes in growths of exposed snails throughout the exposure period (4 weeks). The survival rates of snails exposed to 0.06 ppm of Vertimec for 24 hrs / week or 72hrs / week could not survive more than three or one week respectively . EVALUATION OF THE PLANT PESTICIDES VERTIMEC884 Vertimec was more effective against Schistosoma mansoni (miracidia and cercariae) than Match, as these larval stages were killed within one hour of exposure to LC25, LC50 or LC90 of these pesticides | ||||
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