Alternatives to synthetic fungicides in controlling postharvest anthracnose and stem-end rot in mango

L.C. Karunanayake, G.D. Sinniah, N.K.B. Adikaram, C.L. Abayasekara
Control of postharvest diseases anthracnose and stem-end rot (SER) in mango cultivar 'Karuthacolomban' was attempted using means other than fungicides. The synthetic elicitors Bion®, salicylic acid (SA) and Kasil® were applied as postharvest treatments. All three products reduced anthracnose development. Bion® being most effective at 50 mg L-1 with over 80% reduction in anthracnose lesion area, SA being effective at 500 mg L-1 and Kasil® at 1000 mg L-1. The most effective concentrations of Kasil® and SA were applied preharvest as soil drenches or fruit sprays, respectively. Both treatments were effective in reducing anthracnose in harvested fruit. SA sprays were more effective at 500 mg L-1 on fruit at mid-fill, while 100 mg L-1 sprays were more effective on mature fruit. Overall, spraying of SA was more effective on fruit at mid-fill, with over 66% reduction in lesion area. A potassium fertilizer was also applied in the field as a separate experiment. Results indicate that all elicitors tested were effective in controlling anthracnose of mango. The most effective being Bion®. SER was effectively controlled with 45-28% reduction in lesion area by an higher (three times recommended) dose (2055×3 g tree-1 year-1) of potassium fertilizer. Total soluble phenols, cell wall bound phenolics and chitinases were induced by SA treatment, while antifungal compounds were increased by Kasil® treatment.
Karunanayake, L.C., Sinniah, G.D., Adikaram, N.K.B. and Abayasekara, C.L. (2016). Alternatives to synthetic fungicides in controlling postharvest anthracnose and stem-end rot in mango. Acta Hortic. 1144, 453-460
DOI: 10.17660/ActaHortic.2016.1144.67
https://doi.org/10.17660/ActaHortic.2016.1144.67
elicitors, potassium fertilizer, Kasil®, Bion®, salicylic acid, postharvest diseases, induced resistance
English

Acta Horticulturae