Vol. 6, Issue 4, Part A (2019)

Fig. 1: Transverse section (a) (400 X) and electron micrograph (b) (4000X) in the midgut region of untreated 3^rd larval instar of Culex pipiens.( e.c.= epithelial cell. g.l.= gut lumen. n= nucleus. l.m.= longitudinal muscle. b.b.= brush border, p.m. Peritrophic membrane, m =microvilli, m=mitochondria, e.r.= endoplasmic reticulum)

Fig. 2: Transverse section (a)(400X) and electron micrograph (b&c) (2000X & 2500X) in the midgut region of Culex pipiens larvae treated with Azadirachta indica.(e.c.= epithelial cell. g.l.= gut lumen. n= nucleus. L.m.= longitudinal muscle. b.b.= brush border. v= vacuoles).

Fig. 3: Transverse section (a) (400X) and electron micrograph (b) (4000X) in the midgut of 3^rd larval instar of Culex pipiens treated with Eucalyptus regnans.( e.c.= epithelial cell. g.l.= gut lumen. n= nucleus. b. m. = basement membrane. L= lipids, f.p.m = folded plasma membrane

Fig. 4: Transverse section (a ) (400X) and electron micrograph (b & c ) (1000X &3000X) in the midgut of treated 3rd larval instar of Culex pipiens treated with Piper nigrum.( e.c.= epithelial cell. g.l.= gut lumen. n= nucleus. b.b.= brush border, ch= chromatin. p.m.=peritrophic membrane.