Abstract
Toxicity of two plant extracts against Culex quinquefasciatus mosquito larvae was measured in this work. The plants include the species; Silybum marianum and Nerium oleander. Their Lc50 and Lc90 after 4-hrs were evaluated against three instars of the mosquito. S. marianum Lc50 values were: 57, 214, and 379 ppm for the three instars respectively. S. marianum Lc90 values were: 2422, 2936, and 3161 ppm for the three instars respectively. N. oleander Lc50 values were: 161, 194, and 360 for the three instars respectively. N. oleander Lc90 values were: 1968, 2004, and 4203 for the three instars respectively. The results showed that the 1st instar larvae were more sensitive than the 2nd instar larvae, and this was more sensitive than the 3rd instar larvae. The results of recent work showed high correlation rate between logs of S. marianum and N. oleander concentrations and C. quinquefasciatus mortality percentage probits for all three larvae stages with high R values (0.911, 0.914 and 0.997) (0.993, 0.970 and 0.943) respectively. The aim of this study is to screen plant materials sources can be used in mosquito control.
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