Robertson, G.I.; Dance, H.M. 1971: The association of Phytophthora megasperma with crown rot of apple trees. New Zealand Journal of Agricultural Research 14: 509-514.

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Robertson, G.I.; Dance, H.M. 1971: The association of Phytophthora megasperma with crown rot of apple trees. New Zealand Journal of Agricultural Research 14: 509-514.