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Honeydew from artificial medium laced with salicylic acid (SA) increases SA levels in planta. Two thousand whiteflies were fed artificial diet (AD) with or without 100 μg/ml SA for 72 h. The honeydew was subsequently collected, and 20 μl applied to undamaged leaves for 1 h. SA levels were subsequently measured by LC-MS/MS. Asterisk indicates a significant difference (ANOVA, followed by Scheffé posthoc test P < 0.01); error bars represent standard errors (N = 4)
