AbstractPenetration of bean (Vicia fabavar. Maris Bead) foliage by asulam was found to be affected differently by different surfactants. Some anionic and non‐ionic surfactants brought about a significant increase compared with the aqueous control, others were similar to the aqueous control and one caused a significant reduction. High humidity increased asulam uptake and the effect was still further enhanced in the presence of Tween 20. High humidity was also found to influence asulam penetration in the presence of glycerol. With urea, uptake was greater under high humidity conditions and in the presence of Tween 20. A similar enhancement of penetration was found with potassium ethyl xanthate at lower concentrations (0–0.20) in the presence of Tween 20. On the other hand, reduced uptake resulted at higher concentrations (0.40–1.00). Tributyl phosphate brought about an increase in penetration at concentrations greater than 0.75. However, both potassium ethyl xanthate and tributyl phosphate were shown to damage the leaf su
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