Abstract
Nut-rot during storage is a serious problem in New Zealand chestnuts and is causing severe economic loss to the industry. During the 1998 season, nut samples of 31 varieties from grower properties and research orchards in the North and South Island were assessed for fungal infection and rotting. The fungus Phomopsis castanea was found to be associated with both rotten and healthy nuts in all the North Island samples, although there was a large variation in incidence between varieties and locations. Samples from Rotorua, Bulls and Taupo had lower disease incidence while samples from South Auckland, Waikato, Whangarei, Bay of Plenty and Tauranga had the highest disease incidence. P. castanea was not found in growers’ samples from the South Island, although it was associated with all six varieties from Lincoln University Orchard. Other fungi isolated from rotten nuts were Botrytis cinerea and species belonging to Penicillium, Fusarium and Pestalotia.
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