Esters of 2-bromo-, 4-bromo-, 2-iodo- and 4-iodo- 3,5-dinitrobenzoic acids show considerable antifungal activity in spore germination tests against Alternaria brassicicola, Botrytis cinerea, Septoria nodorum and Uromyces fabae. They act as protectant fungicides against Erysiphe graminis, Puccinia recondita and Septoria nodorum on wheat and Botrytis fabae on 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 chocolate spot on broad bean.