Articles

Resin canal discoloration of mango fruit: impact of sanitizer, harvest time and presence of fruit peduncle at harvest

Article number
1404_124
Pages
909 – 916
Language
English
Abstract
Mango fruit suffers from resin canal discoloration (RCD), which lowers fruit quality and makes mango production less profitable.
Although biological factors have been associated with the RCD problem, the responsible organism has not yet been confirmed.
The objective of this study was to screen sanitizers such as water (control), lactic acid, chlorine, ascorbic acid, salicylic acid hypochlorite, Mango Wash®, Nylate®, and Scholar® to control RCD infection.
It also aimed to evaluate the effect of harvesting fruits with and without a peduncle, as well as harvest time (morning and midday), on the incidence of RCD in the ‘Kensington Pride’ (KP) mango cultivar.
RCD infection was induced by spray inoculating visually healthy KP mango fruits with a slurry from RCD-infected fruits.
The percentage of RCD infected fruits was computed and the severity of RCD was scored using a rating scale of 1 to 5, with 1 having the lowest (0-15%) and 5 having the highest (85-100%). Results showed that Nylate® significantly (p<0.01) reduced RCD severity score (0.44) and infection percentage (22%) compared with that of the control (water) and other sanitizers (severity scores >1; infection percentage >70%), but was comparable with that of Mango Wash® (severity score = 1; 40% fruit infection). Moreover, harvesting the fruit with a short peduncle resulted in a significantly (p<0.05) lower RCD severity score (0.13) and infection percentage (11%) than harvesting fruits without a peduncle (severity score = 0.35; 38% fruit infection). There was also a higher (p<0.05) incidence of RCD observed in fruit harvested at midday (severity score = 1.35; 74% fruit infection) than those harvested in the morning (severity score = 0.74; 42% fruit infection). This study suggests that implementing effective postharvest sanitation method and using harvest practices may offer a practical method of reducing RCD incidence in mango fruit.

Publication
Authors
C.A. Asis, A. Niscioli
Keywords
biotic factor, fruit disorder, harvesting practices, pathogen, quality defect
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