Combined Effect of Methanol Extracts and Essential Oils of Callistemon rigidus (Myrtaceae) and Eucalyptus camaldulensis (Myrtaceae) against Anopheles gambiae Giles larvae (Diptera: Culicidae)

Table 4

Synergistic factor and cotoxicity index of the combination of the methanol extracts of E. camaldulensis and C. rigidus.

Combinations	LC50 (ppm)	Synergistic factor	Cotoxicity index	Type of action
E100% : C0%	408.90	—	—	—
E75% : C25%	117.91	1.031	103.177	Additive
E50% : C50%	183.37	0.389	38.969	Antagonistic
E25% : C75%	106.21	0.476	47.632	Antagonistic
E0% : C100%	39.15	—	—	—

E100%, 75%, 50%, 25%, and 0% = E. camaldulensis 100%, 75%, 50%, 25%, and 0%, respectively; C100%, 75%, 50%, 25%, and 0% = C. rigidus 100%, 75%, 50%, 25%, and 0%, respectively.