AbstractStudies have been carried out on the herbicidal action of asulam [methyl (4‐aminophenylsulphonyl)carbamate] and sulphanilamide, alone or in association either with 4‐aminobenzoic acid (4ABA) or 4, 6‐diamino‐1‐(3, 4‐dichlorophenyl)‐1, 2‐dihydro‐2, 2‐dimethyl‐1,3,5‐triazine (DCDT). The soaking of wheat seeds (Triticum estivumL.) for 12 h at 30°C in asulam and DCDT in a 10:1 ratio doubled the inhibition of root growth produced by soaking in asulam alone; the addition of 4ABA partially reversed the activity of asulam. Foliar applications of a mixture of asulam + DCDT (1.1 + 0.55 kg ha−1) markedly increased the activity of asulam in susceptible wheat, wild oat (Avena fatuaL.), tolerant flax (Linum usitatissimumL.), and inStellaria mediaL. The activity of asulam at 1.1 kg ha−1was reversed by 4ABA at 2.2 kg ha−1by about 50% in wheat and wild oat, 82% in flax and 100% inS. media.The results indicate that asulam and sulphanilamide act by similar mechanisms in apparently inhibiting
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