CMYK fourcolor mode optimization of colour board for trapping Myzus persicae

Key Words：Myzus persicae, simulated colour board, trap, orthogonal optimization

Abstract：      Quantitative bioassays on selection responses of alate Myzus persicae（Sulzer） to CMYK，the colour mixture of cyan, magenta, yellow and black, were conducted using computer simulated colours, designed with the orthogonal optimization method. Results of the first experiment using L25(5⁶) array design showed that the factorial effects were as follows: Y>M>K>C. The best theoretical mixed colour parameters were C=25%, Y=25%, M=100%, K=0, and the leaf colour competitive coefficient (LCC) of alate M. persicae to this mixed colour reached up to 77.78%. Results of the second experiment using L16(4⁵) array design showed that all the CMYK parameters have not significant effect on LCC values of the simulated colour, when the C, M, Y and K values were in the ranges of C∈［10%, 40%］, M∈［10%, 40%］, Y∈［85%, 100%］, and K∈［0, 15%］ respectively. The regression equation of LCC with yellow component and black component was LCC＝0.0390Y²-0.1875Y＋0.5591 (R²＝0.9913) and LCC＝0.0163K²-0.1237K＋0.6176 (R²＝0.7926), respectively.