The susceptibility of Thai and Australian mango cultivars to sap injury and possible means of control. [Workshop paper]
1994
O'Hare, T.J. (Queensland Dept. of Primary Industries, Hamilton (Australia). Horticulture Postharvest Group)
Thai mango cultivars (Nam Dok Mai, Nang Klang Wun, Tong Dum and Kaew Sawoey) were less susceptible to sap injury than 'Kensington' (an Australian cultivar). The degree of sap injury was regulated by several factors including total sap flow, oil content in sap, and lenticel distribution. Sap flow of Thai cultivars was considerably lower (0.17-0.47 mL per fruit) than 'Kensington' (1.67 mL per fruit). The proportion of oil in the initial sap fraction collected from Thai cultivars (2.2-15.8 percent oil) was also substantially lower than 'Kensington' (52 percent oil). Damage occurred where sap flowed over lenticels, and consequently fruit with higher lenticel densities were more prone to injury. Destemming fruit in a 1 percent Cold Power (detergent) solution reduced sap injury to fruit, but was not as effective as 1 percent calcium hydroxide solution. Cold Power appeared to increase the wettability of fruit, allowing penetration of sap into cuticle cracks, creating a finer, more evenly spread injury. Dipping fruit in Cold Power immediately prior to destemming fruit in air was partially effective in reducing sap injury and may have acted as a physical barrier to sap entry.
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