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Adapted from Castle et al.22. 1, BYDV-infected wheat; 2, sham-inoculated wheat; 3, vial (5.5 x2.5 cm; Lx D) initially containing 50 aphids; 4, tube (16x2.5 cm; LxD); 5, platform (15 cm; D); 6, lid enclosing the arena.
