Lesions on infected fruit will also spread in storage. Glomerella is a major problem in Auckland, Waikato and sometimes Poverty Bay, but it occurs in other fruit growing regions in New Zealand. Granny Smith and Sturmer are particularly susceptible to Glomerella . The disease can cause major fruit losses in a warm, wet season. All fruit showing even the smallest lesion must be graded out of a line, otherwise rotting may develop further in coolstore.
Secondary infections can also develop.
Protectant fungicide cover is necessary from mid to late November until harvest if Glomerella is likely to be a problem. Mancozeb, ziram and captan are the main fungicides currently used for Glomerella control. Chlorine is added to the water dump or rinse at the packhouse to prevent the spread of spores. Orchard hygiene is extremely important. Removing and destroying all mummified fruit at pruning will prevent the carryover of the spores.