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(a) Principal component (PC) 1 and PC2 of the genome‐wide SNPs of potato psyllids colored by COI haplotype. Red arrows indicate two northwestern COI haplotypes that clustered with western COI‐haplotype psyllids. (b) fineRADstructure clustering and coancestry matrix for 124 potato psyllids that were characterized as NW or W COI haplotypes. Coancestry measures genetic similarity of two individuals; higher coancestry (colder color) indicates less divergence of two individuals
