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Fluorescence micrographs of cross section in the midribs of (A) Citrus macrophylla, (B) Dogfennel, (C) Primrose, and (D) Spanish needle leaves on which Diaphorina citri adults were caged for 4 days (n = 3). D. citri stylet tracks (salivary sheaths, arrows) terminated in the phloem (ph) in C. macrophylla (A), but terminated in xylem vessels (xy) in the three tested weeds (B–D). Abbreviations: pa: parenchyma; ph: phloem; tr: trichomes; xy: xylem. Scale bars = 50 µm.
