Copper alternatives for the control of bacterial black spot - further progress.
Willis A., Mabunda R. S.
Author Affiliation: Merensky Technological Services, Westfalia Estate, P O Box 14, Duiwelskloof 0835, South Africa.
Research Journal - South African Mango Growers' Association 24 : 61-62
Abstract : This study evaluated the efficacy of low copper-content products for the control of bacterial black spot (BBS, Xanthomonas campestris pv. mangiferaeindicae) and postharvest diseases of mango. Four copper products and an untreated control were evaluated on one hectare of Keitt mangoes in the Mooketsi area, Limpopo Province, South Africa during the 2003/04 season. Fruit loss due to bacterial black spot was monitored weekly from December onwards, and the total fruit loss due to disease was determined for the season for each treatment. Fruit samples were taken for shipment simulation, and evaluated for postharvest diseases and disorders. Nordox (cuprous oxide at 100 g/100 litres) was as effective as copper oxychloride (300 g/100 litres) for the control of bacterial black spot, while Kocide (copper hydroxide at 225 g/100 litres) and Cuprotect (copper acetate at 500 ml/100 litres) were significantly less effective. Copper oxychloride, Kocide and Nordox were equally effective in controlling anthracnose (caused by Glomerella cingulata) as well as stem-end rot and soft brown rot (both caused by Botryosphaeria spp., formerly known as Nattrassia mangiferae). Nordox resulted in half the amount of copper being applied to the orchard in one season.