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ISHS Acta Horticulturae 509: VI International Symposium on Mango

DIFFERENCES IN THE EFFECT OF VARIOUS PACKLINE FUNGICIDAL TREATMENTS ON THE MANIFESTATION OF DISEASE IN MANGO

Author:   S.A. Oosthuyse
Keywords:   fungicidal treatment, disease manifestation, mango
DOI:   10.17660/ActaHortic.2000.509.84
Abstract:
Zill and Kent mangoes, highly predisposed to anthracnose (Colletotrichum gloeosporioides) infection, were exposed to various packline fungicidal treatments either incorporating benomyl or prochloraz. Following treatment, the fruits were placed in cool-storage at 12.5°C for 28 days. After cool-storage, disease incidence and severity, as well as various fruit quality attributes, were assessed.

All of the treatments incorporating prochloraz exhibited superior anthracnose control directly after cool-storage. On ripening the treatment, hot water dip at 50°C for 5 minutes; prochloraz added to the hot water bath (180 ml Omega/100 1 H2O), was the only one among those evaluated to result in a statistically significant and clear reduction in anthracnose in both of the cultivars used. This treatment increased surface scale (localised skin darkening) and internal breakdown in Zill, but not in Kent. In Kent it resulted in an increase in ground skin coloration and total soluble solids content. Hot benomyl treatment (5 min. at 50°C; 200 g Benlate/100 1 H2O) was as effective in controlling anthracnose as was hot water treatment alone (5 min. at 50°C).

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