الفعالية الحيوية للمستخلصات الخام لثلاث نباتات في هلاك الأطوار غير البالغة لبعوض الكيولكس Culex pipiens molestus Forsakl (Culicidae : Diptera)‎

Abstract EN

The bioinsecticidal properties of three plants, Achillea fragrantissima (Forssk) She.

Bip., Arnebia decumbens L.

and Juglans regia L.

were tested as larvicides and pupicides on the mosquito, Culex pipiens molestus Forsakl.

All the applied extracts caused 100 % mortality for the second and last instars after 24 and 48 hr.

of exposure time.

Pupal mortality was 100 % at the concentration, 500 ppm, of A.

fragrantissma and 600 ppm at both A.

decumbens and J.

regia at the two exposure times.

The Lc50 values after 24 and 48 hr.

of exposure times were 70 and 35 ppm for A.

fragrantissima, 110 and 65 ppm A.

decumbens and 145 and 110 ppm for the second instar, while Lc50 for the fourth instar after the same exposure time were 100,65 ; 150,78 and 170,115 ppm respectively.

Later, Lc50 values for the pupal instar were 260,190 ; 350, 270 and 400, 310 ppm for the two exposure times respectively.