Podosphaera tridactyla (Wallr.) de Yes (AQSIQ Yes. ACT, NSW, Yes. Fruit and leaves Yes. Hosts include Assessment not No Bary 2006b) Qld, SA, Tas., Vic. of P. persica can both almond, cherry, peach required. (Plant Health be infected (Grove and plum (Farr et al. [Erysiphales: Erysiphaceae] It was assessed as Australia 2001). 1995). 1989). These plants unlikely to have Plum powdery mildew Listed as a are widely distributed potential for regulated pest in Western Australia. economic (prohibited Powdery mildews consequences in the (section 12)) in generally grow and IRA for summerfruit the Western spread well in from eastern Australia BAM Act warmer climates. The Australia into WA 2007(Government fungus overwinters as (Poole et al. 2011) as of Western cleistothecia on the the requirement for Australia 2014). surface of shoots, on management dead leaves on the measures to control ground in orchards the more severe and on bark. powdery mildew Ascospores are pathogens produced from these (Sphaerotheca structures during pannosa and spring rains and Podosphaera infect the developing clandestine) present foliage (Grove 1995). in WA. Climatic conditions in Western Australia are favourable for the establishment of P. tridactyla, given that other closely related powdery mildews are already established in Western Australia.
Podosphaera tridactyla (Wallr.) de Bary [Erysiphales: Erysiphaceae] Plum powdery mildew Yes (AQSIQ 2006b) Yes. ACT, NSW, Qld, SA, Tas., Vic. (Plant Health Australia 2001). Listed as a regulated pest (prohibited (section 12)) in the Western Australia BAM Act 2007(Government of Western Australia 2014). Yes. Fruit and leaves of P. persica can both be infected (Grove 1995). Yes. Hosts include almond, cherry, peach and plum (Farr et al. 1989). These plants are widely distributed in Western Australia. Powdery mildews generally grow and spread well in warmer climates. The fungus overwinters as cleistothecia on the surface of shoots, on dead leaves on the ground in orchards and on bark. Ascospores are produced from these structures during spring rains and infect the developing foliage (Grove 1995). Climatic conditions in Western Australia are favourable for the establishment of P. tridactyla, given that other closely related powdery mildews are already established in Western Australia. Assessment not required. It was assessed as unlikely to have potential for economic consequences in the IRA for summerfruit from eastern Australia into WA (Poole et al. 2011) as the requirement for management measures to control the more severe powdery mildew pathogens (Sphaerotheca pannosa and Podosphaera clandestine) present in WA. No
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