| phytophthora captiosa sp. nov. and p. fallax sp. nov. causing crown dieback of eucalyptus in new zealand. | a locally severe crown disease of exotic plantation eucalyptus trees has been recorded periodically in new zealand since 1986. symptoms include leaf spots, petiole infection and twig and small branch lesions. outbreaks of disease are episodic and individual trees may show marked variation in crown symptoms ranging from unaffected to total defoliation. two previously unknown species of phytophthora are associated with the disease. these are described and formally designated here as p. captiosa, f ... | 2006 | 16650734 |