Cunningham, G.H. 1921: A note recording the presence in New Zealand of the perithecial stages of apple and pear black-spot. New Zealand Journal of Agriculture 23: 219-221.

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Cunningham, G.H. 1921: A note recording the presence in New Zealand of the perithecial stages of apple and pear black-spot. New Zealand Journal of Agriculture 23: 219-221.