Wild flowers, Phytophthora cinnamomi, Botrytis, Alternaria alternata
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The native flora of Australia has evolved in such a way as to render it resistant to many of the fungi and bacteria that commonly infect exotic cultivated flower crops. Many of our native plants have tough sclerophyllous foliage which makes it difficult for pathogenic organisms to gain access, particularly in their natural undisturbed habitats. Root tissue of these plants also tends to be woodier than that of exotic plants, thus making it less accessible as a food source for common rootattacking fungi such as Rhizoctonia and Pythium.
Wood, Peter McR
"Diseases of native flowers,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 29:
4, Article 4.
Available at: https://researchlibrary.agric.wa.gov.au/journal_agriculture4/vol29/iss4/4