MANGO SAPBURN AMELIORATION IN THE NORTHERN TERRITORY
A rapid, simple, cheap, and reproducible method was devised to screen chemicals for amelioration of sapburn injury. A series of experiments showed that dabbing in vegetable oil or dipping in DC Tron oil at 100–1000 μl/L was more efficacious than similar rates of Agral 60. Subsequent experiments confirmed that dipping in DC Tron at 100–1000 1000 μl/L for up to a minute gave excellent protection against sapburn injury when compared with similar rates of Ethokem, Agral 60, CropLife, Codacide, and 1% Chlorsan or calcium hydroxide. Fruits so treated with DC Tron ripened and coloured normally with no off-flavour or reduction in quality. Desapping under DC Tron solution (300 μl/L) again gave better protection than desapping under calcium hydroxide (1%) or water. However, some fruit appeared slightly dirty because of contact with the sap on the solution surface. The activity of DC Tron can be stripped by the exuding sap in the solution; this stripping action was evident by the development of some sapburn on fruit after 150–250 fruit had been desapped in the same DC Tron solution. Fruit treated in calcium hydroxide had undesirable whitish residues on the fruit skin. Dipping fruit with stems attached in 300 μl/L DC Tron for 15, 30 60, 120, and 180 minutes revealed that blotchiness of fruit tended to increase with dip time. Also, off-flavours were detected in severely blotched fruit.
Lim, T.K. and Kuppelweiser, W. (1993). MANGO SAPBURN AMELIORATION IN THE NORTHERN TERRITORY. Acta Hortic. 341, 518-527