Abstract:
The use of defense elicitors; which are agents that stimulate or trigger disease resistance
responses in plants have proved to be attractive alternatives to hazardous chemical
fungicides in recent years. The present study investigated the possibility of using
Salicylic acid and Bion® as postharvest elicitors on mango fruit. Three local mango
cultivars were used in the study, ‘Karuthacolomban’, ‘Rata’ and ‘Willard’. Salicylic
acid was applied as a postharvest spray at concentrations, 100, 500 or 1000 mg/L and
Bion® (Acibenzolar-s-methyl, 500 WG, SYNGENTA) at 25, 50, 100 and 200 mg/L.
Disease development following artificial inoculation (10 5 conidia / ml suspension) was
assessed. Both elicitors were effective (P<0.05) in controlling postharvest anthracnose.
The most effective concentration of SA was 500 mg/L for ‘Rata’, 100 mg/ L for
‘Willard’ and both 100 and 500 mg/L for ‘Karuthacolomban’. In Bion® the most
effective concentration was 50 ppm for ‘Rata’ and ‘Willard’ and 25 ppm for
‘Karuthacolomban’. In SA treated fruits the percentage reduction in anthracnose
ranged from 40- 77 % while values ranged from 67 – 99% for Bion® treated fruits.
Results indicate that both SA and Bion® can be used to control postharvest mango fruit
loss due to anthracnose.
