ISHS Acta Horticulturae 455: V International Mango Symposium
BIOLOGY AND CONTROL OF NATTRASSIA MANGIFERAE |
| Author: | W.C. Saaiman |
| Keywords: | soft brown rot, blossom blight, stem end rot, critical infection periods, copper-oxychloride, flusilazol |
| Abstract:
Nattrassia mangiferae has been associated with various diseases in a number of different crops. In South Africa it is the causal organism of several diseases occurring in mango. These are blossom blight, and the postharvest diseases, soft brown rot and stem-end rot. It is thought that N. mangiferae infects the inflorescence at an early stage during flowering. After infection, it spreads systemically through the inflorescence into the fruit where it remains latent until the fruit begins to ripen. In the present study the aim was to formulate effective control measures. In order to do so it was necessary to determine the sources of inoculum and the time of infection. Commercially, blossom blight is currently effectively controlled by sprays of the systemic fungicides flusilazol or pyrazophos. In the current study various other chemicals were also tested pre-harvest for effectiveness in controlling soft brown rot and stem-end rot occurring postharvest on the fruit. Of all the fungicides tested, monthly pre-harvest applications of copper-oxychloride during the period from fruit set until harvest resulted in significantly improved disease control. | |
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