دراسة تاثير تراكيز مختلفة لبعض العناصر النزرة على الاطوار اليرقية لبعوض Culex pipienis

Abstract

Abstract The study involved toxicity effect of Cd,Pb,Mn on Culex pipienis larvae.Five concentrations of cadmium nitrate and lead acetate 1,1.5,2,2.5,3 mg/L and 10,20,30,40,50 mg/L of manganese chloride were used in this study .Statistical analysis showed that all five concentrations had significantly affected first and second larval instars especially, as they caused highest mortality in these stages than others, on the other hand Cd was the most toxicant metal on larval stages ,Mn was the second and Pb was the third toxicant metal. Cd >Mn >Pb.LC50 for cadmium nitrate werw1.5,2.5,3.12,50.88mg/L for first,second ,third and forth larval instars respectively ,LC50 for lead acetate were 2.5,3.5,4.5,2.63 mg/L forfirst, second,third and forth larval instars respecptively and LC5O for manganese chloride were 30,37,95,107mg/L for first,second,third and forth larval instars respectively. ,