The level of quiescent infection of Alternaria alternata in mango fruits at harvest determines the postharvest treatment applied for the control of rots during storage
2002
Prusky, D. | Shalom, Y. | Kobiler, I. | Akerman, M. | Fuchs, Y.
The effectiveness of different postharvest treatments to control different levels of quiescent infections of Alternaria alternata causing Alternaria rot in mango fruits during storage was compared. A combined hot water spray and fruit brushing (hot water brushing-HWB) treatment for 15-20 s with 225 microgram ml(-1) prochloraz was the most effective treatment to control Alternaria rot in fruit with a high relative quiescent infected surface (RQIS) rating of 36 at harvest. Comparable control was obtained with the commercial treatment of 900 microgram ml(-1) prochloraz spray. However, Alternaria rot in mango fruit with an intermediate level of RQIS rating of 25 was controlled by HWB treatment alone or HWB with chlorine (300 microgram ml(-1) Troclosene Na). HWB alone was effective enough to control postharvest decay in fruit with a RQIS of five. Present results have indicated that effectiveness of postharvest HWB and prochloraz applications are dependent on the quiescent infected area of the fruit by A. alternata at harvest. A RQIS rating, before harvest, has resulted in the use of effective, mild, fungicides as a single postharvest treatment thus avoiding wide use of less friendly synthetic fungicides.
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