Reduced translucency and the addition of black patterns increase the catch of the greenhouse whitefly, Trialeurodes vaporariorum, on yellow sticky traps.

Analysis by orthogonal contrasts showed a highly significant overall effect of pattern ( F (1,57) = 14.5, P <0.001), which was significant on the front of the trap ( F (1,57) = 12.2, P = 0.001) as well as on the back ( F (1,57) = 7.3, P = 0.009).

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