Hibiscus, Phytophthora nicotiana var. parasitica, Western Australia
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FLOWERING hibiscus have been one of the most popular ornamentals in the home garden for several years.
However since about 1959, many home gardeners have been disappointed to see their hibiscus attacked and destroyed by a collar rot.
This disease, which is new in Western Australia, has been most destructive on the popular Apple Blossom variety.
MacNish, G C.
"Hibiscus collar rot,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 4
, Article 10.
Available at: https://researchlibrary.agric.wa.gov.au/journal_agriculture4/vol4/iss8/10