[Objectives] To evaluate the effectiveness of the botanical pesticide 0.3% azadirachtin (AZ) EC as a means of controlling the oriental fruit moth (Grapholita molesta). [Methods] Immersion and dipping tests were used to determine the insecticidal activity of AZ EC against 1-day-old eggs, 3-day-old eggs, 5-day-old eggs, third instar larvae and fifth instar larvae, and the residual film method to assess the toxicity of this pesticide to newly hatched larvae. The degree and duration of control by spraying AZ EC was also investigated in the field. [Results] LC₅₀s of AZ EC with respect to 1-day-old eggs, 3-day-eggs, 5-day-old eggs, and newly hatched larvae, were 6.5195, 4.5789, 6.6268, 6.0495 mg/L, respectively, but the pesticide had no effect on third instar larva and fifth instar larvae. Application of AZ EC at dosages of 2.0-3.0 mg/L reduced the abundance of G. molesta in the field by 63.18%-76.22% 5-10 days after spraying, but decreased to just 27% 15 days after spraying. [Conclusion]  AZ EC is not an effective insecticide against G. molesta.