AbstractEsters of 2‐bromo‐, 4‐bromo‐, 2‐iodo‐ and 4‐iodo‐ 3,5‐dinitrobenzoic acids show considerable antifungal activity in spore germination tests againstAlternaria brassicicola, Botrytis cinerea, Septoria nodorumandUromyces fabae. They act as protectant fungicides againstErysiphe graminis, Puccinia reconditaandSeptoria nodorumon wheat andBotrytis fabaeon broad bean. The most active compounds are methyl and ethyl 4‐bromo‐3,5‐dinitrobenzoates which give better control of wheat rust than oxycarboxin and methyl 4‐iodo‐3,5‐dinitrobenzoate which is at least as effective as captan against Septoria leaf spot on wheat. Several of the esters are superior to captan in controlling