Trees of Lagerstroemia speciosa Pers. were damaged by major harmful insects. Among the harmful insects are aphids. Ladybird beetle Coccinella transversalis Fabricius is one of the aphid predators. Research on the life history of ladybird beetle C. transversalis is basic for the use of C. transversalis as agent for aphid biocontrol on L. speciosa. At temperature and relative humidity under laboratory conditions, the life cycle of C. transversalis was on average 12,84 - 13.99 days. C. transversalis laid an average of 31.01 eggs per day and 239.4 eggs per femal adult. First instar larva consumed on average 15 aphids per day, and the second instar larva: 29.5 aphids per day. Adult consumed on average 104 aphids per day in the laboratory and 135.5 aphids per day on street trees. Seedlings of L. speciosa were infected heavily by aphids at grade 5, it was reduced to grade 0 after releasing ladybugs C. transversalis in the net house after 9 days. Trees of L. speciosa on the slree Infected heavily by aphids at grade 5 were reduced to grade 0 after releasing lady bird beetle C. transversalis after 4 - 6 days.