Aphicidal and Behavioral Effects of Vicia faba L. (Fabales: Fabaceae) Leaf Extracts against Aphis fabae Scopoli (Hom., Aphididae)

The effects of methanolic and aqueous leaf extracts of the aphid resistant cultivar, CV-12 of broad bean (Vicia faba) on the behavior and mortality of the black bean aphid, Aphis fabae were compared. The main objective of the study was to assess the effects of extracts of V. faba leaves an available insecticide against A. fabae. The results showed that the aqueous leaf extracts of the cultivar CV-12 had a repulsive effect against A. fabae (aver. 1.3 adults / leaf) compared to methanolic leaf extracts of the same cultivar (aver. 3.7 adults / leaf). The results revealed that the methanolic extracts had a toxic effect induced a high A. fabae mortality that reached up to 65.71% compared to the aqueous leaf extracts (mortality rate = 1.43%). The present study suggests that extracts from leaves of resistant cultivar CV-12 have insecticidal and repellent properties against A. fabae and could be used as an alternative of chemical insecticides in an integrated pest management program to A. fabae.