[Objectives]  To test the attractiveness of different colored sticky cards to the green peach aphid, Myzus persicae in order to optimize environmentally-friendly control techniques for this pest. [Methods]  The attractiveness of eight different yellow cards, and bi-colored cards, to M. persicae was tested in the lab with the RGB color designed by the Photoshop software. [Results]  The No. 3 yellow card with an RGB value of 215 : 255 : 6 was the most attractive, attracting 8.50 individual/card. The color of this card was then combined with other colors to make bi-colored cards. At an area ratio of 2 : 1 of No. 3 yellow to other colors, only the No. 3/black card attracted less aphids than the No. 3 yellow card. At an area ratio of 1 : 1, the No. yellow 3 card was more attractive to aphids than all bi-colored cards, indicating that increasing the area other colors decreased the attractiveness of bi-colored cards. Significant differences were observed among bi-colored cards indicating that different color patterns affect the attractiveness of bi-colored cards to aphids. These results provide a foundation for optimizing the use of yellow sticky card to capture aphids in the field. [Conclusion]  The No. 3 yellow sticky card is the most attractive to aphids.