Efficacy of sprays with different copper dosages against canker. Autumn treatments with different copper hydroxide formulations (Cuprozin WP, Funguran progress and Cuprozin progress) and copper oxide (Nordox 75 WG) were evaluated in a young ‘Nicoter’/Kanzi™ plantation which was at the end of its second year at the beginning of the trial. Sprays were made at the dosage (ha−1 m−1 canopy) and dates indicated. The canopy height was 2.0 m in the first spraying season, and 2.5 m in the second season. The development of canker on twigs was evaluated for the two seasons succeeding annual autumn sprays, and for the 2017 season following a standard treatment of all variants with three Funguran progress sprays by the farmer. Disease incidence assessments with removal of all cankers were made 5–7 times throughout each season. Treatments labelled with asterisks were significantly different (* P < 0.05) from the untreated but pruned control, as described in the legend to Fig. 7.