Pacific Pests and Pathogens Pacific Pests, Pathogens & Weeds - Mini Fact Sheet Edition

Citrus root & collar rot (264) Print Fact Sheet


Common Name

Citrus root and collar rot, Phytophthora foot and root rot (Phytophthora nicotianae), and brown rot of citrus fruit (Phytophthora citrophthora).

Scientific Name

Worldwide; two species are commonly found causing root and collar rots on citrus: Phytophthora nicotianae, and Phytophthora citrophthora.

AUTHOR Grahame Jackson
Photo 1 Kohler F, Pellegrin F, Jackson G, McKenzie E (1997) Diseases of cultivated crops in Pacific Island countries. South Pacific Commission. Pirie Printers Pty Limited, Canberra, Australia. Photo 2 Diseases of fruit crops in Australia (2009). Editors, Tony Cooke, Denis Persley, Susan House. CSIRO Publishing. Information from Hardy S, Barkley P, Creek A, Donovan N (2012) Impacts and management of flooding and waterlogging in citrus orchards. NSW Government Department of Primary Industries; and from CABI (2015) Phytophthora nicotianae (black shank) and Phytophthora citrophthora (brown rot of citrus fruit) Crop Protection Compendium. (

Produced with support from the Australian Centre for International Agricultural Research under project PC/2010/090: Strengthening integrated crop management research in the Pacific Islands in support of sustainable intensification of high-value crop production, implemented by the University of Queensland and the Secretariat of the Pacific Community.

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