The predatory efficiency of first and fourth instar larvae, adults of the seven-spotted ladybird Coccinella septempunctata and the eleven-spotted ladybird Coccinella undecimpunctata in prying on nymphs and adults of black bean Aphis fabae Scopoli (Homoptera: Aphididae) was evaluated in the entomology laboratory at the College of Education for Girls/University of Kufa in 2021. The results showed that adults of C. septempunctata ladybirds and C. undecimpunctata ladybirds are the most efficient in consuming nymphs and adults of A. fabae. Adults of C.septempunctata ladybird were more competitively efficient at 26.5 individuals/day than adults of C.undecimpunctata which recorded 24.8 individuals/day., The predatory efficiency was 22.7 individuals/day for the fourth instar larvae of C. septempunctata, slightly less than the predatory efficacy of 23.4 individuals/day for the first instar larvae, and the predatory efficiency was 25.5 individuals/day for the fourth instar larvae of C.undecimpunctata than the fourth instar larvae of 22.7 individuals/day for the ladybird a C. septempunctata. The first instar in the two types of ladybirds was less predatory than the rest of the insect's stages.

Aphids, Biological Control, Insect Pests, Larval Stages.