SAP BURN INJURY MANAGEMENT OF MANGOES (MANGIFERA INDICA L.) IN SRI LANKA

摘要

Sap burn injury is one of the major postharvest disorders that causes postharvest losses of mangoes. Popular dessertmango fruits from northern Sri Lanka were selected for this study. Mature mango fruits - ‘Willard’, ‘Karuthakolumban’,‘Chembaddan’ and ‘Ambalavi’ - were harvested carefully with 5cm stalk for different treatments to minimize sap burninjury. Stalks were removed and fruits were dipped in GRAS compounds of 1 & 5% sodium chloride (Table salt) and 0.5 &1% calcium hydroxide separately for 5 minutes. De-stemming and dipping fruits in 5% sodium chloride and 1% calciumhydroxide were effective in reducing sap burn injury in ‘Karuthakolumban’. However, 1% table salt and 0.5% calciumhydroxide successfully reduced sap burn injury in ‘Willard’, ‘Chembaddan’ and ‘Ambalavi’ mangoes. Fruit quality wasmeasured in terms of pH, Total Soluble Solids (TSS) and marketability. Quality parameters of treated fruits were notsignificantly different (P=0.05) from non chemical treated good quality mango fruits. Sap management dynamics was veryuseful in controlling sap burn in ‘Chembaddan’ and ‘Ambalavi’ mangoes. No latex exudation was observed in thesemangoes when stalk was broken by next day after harvesting. These results suggest that low cost environmentally friendlymethods could be used to reduce sap burn injury in mangoes.