Table S1. Relative percentages of chemical compounds comprising the synthetic fruit volatile blends used in the study. WA = western apple, EA = eastern apple, BH = black hawthorn, OH = ornamental hawthorn, DH = downy hawthorn.

Table S2. Percentages of flies of indicated host plant origin from designated sites displaying upwind-directed flight to host fruit volatile blends in flight tunnel assays.

Figure S1. Map of site locations in Washington state from which flies were analyzed in the study. See Table 1 in main text for site descriptions.

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