|Authors: ||L.C. Karunanayake, G.D. Sinniah, N.K.B. Adikaram, C.L. Abayasekara|
|Keywords: ||elicitors, potassium fertilizer, Kasil®, Bion®, salicylic acid, postharvest diseases, induced resistance|
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.
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