Control of dark leaf spot (<i>Alternaria brassicicola</i>) of <i>Brassica oleracea</i> seed production crops with foliar sprays of iprodione

Abstract

SUMMARY Three sprays of iprodione (Rovral 50% w. p.) at 0.5‐1 kg a. i./ha applied to Brassica oleracea seed crops in experimental plots and field trials at 3‐wk intervals from the young green pod stage until cutting controlled pod infection caused by A. brassicicola in seasons 1976–1979. As a result few seeds were infected, seed yields were increased and their germination was improved. Sprays of Bordeaux mixture were as effective as iprodione in years when disease levels were low but were ineffective when infection pressure was severe.