The multi-colored Asian lady beetle (MALB), Harmonia axyridis (Pallas), was tested for preference of the three pecan pest aphids: yellow pecan aphid, Monelliopsis pecanis Bissell, black-margin aphid, Monellia caryella (Fitch), and black pecan aphid, Melanocallis caryaefoliae (Davis), as well as two aphid species common in the pecan system understory: crape myrtle aphid, Lagerstroemia indica L., and cow-pea aphid, Aphis craccivora Koch. Bioassays showed aphids eaten by each of the four instars of MALB larvae over time (fifteen aphids picked randomly from all four instars) of the following combinations: all aphids from the same species, five of each type of the three pecan pest aphids, and three of each of the five aphid species tested. Some significant differences were observed with the bioassays using fifteen aphids of the same species and three each of the five aphid species tested. Overall, no preferences were found between the three species of pecan aphids and crepe myrtle aphids, but there was a lower preference for cowpea aphid. This is part of a comprehensive study on ground cover management to enhance biological control and soil conditions in improved pecan orchards. A brief summary of available results on biological control and soil enhancement will also be given.