Cunningham, G.H. 1923: Black-rot (Physalospora cydoniae Arnaud). A fungous disease of apple, pear, and quince. New Zealand Journal of Agriculture 27: 95-102.

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Cunningham, G.H. 1923: Black-rot (Physalospora cydoniae Arnaud). A fungous disease of apple, pear, and quince. New Zealand Journal of Agriculture 27: 95-102.