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PLANT PEST
Symptoms are malformations in plants, in this case an onion flower,with aster yellows (left) and normal flower yet to open (right).Credit: Lindsey du Toit, Washington State University,Bugwood.org
Phytoplasmas 16Srl group (aster yellows group)Exotic…
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PLANT PEST
Potato cyst nematode produces characteristic cysts on plant roots. This is a close up of cysts that measure only 0.5 mm across.Gordon Berg, DPI Victoria, PaDIL.
Potato cyst nematode (exotic strains)Exotic to Australia (white potato cyst nematode), or under management (golden potato…
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PLANT PEST
Early symptoms of Panama disease are yellowing leaves that collapse into a ‘skirt’.Dr Luadir Gasparotto, Embrapa, PaDIL.
Panama disease Tropical Race 4Restricted distribution in Northern Territory and Queensland (under quarantine control)Features: Soil-borne fungal disease that causes…
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PLANT PEST
Leaves infected with barley stripe rust take on a yellowappearance. Frank Peairs, Bugwood.org
Barley stripe rust (exotic strains)Exotic to AustraliaFeatures: A fungal disease of barley that can cause completecrop lossesWhere it’s from: Asia, Europe, Central Africa and North,…
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PLANT PEST
Leaf blight and shoot dieback on rhododendron caused by sudden oak death.Credit: Sabine Werres BBA, Braunschweig, Germany, PaDIL
Sudden oak death (airborne Phytophthora spp.)Exotic to AustraliaFeatures: A disease caused by airborne species of the fungus-like organism Phytophthora that…
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PLANT PEST
A key symptom of tobamoviruses is mottling of leaves and fruit, here in cucumber.Gerald Holmes, California Polytechnic State University at San Luis Obispo, Bugwood.org
Tobamoviruses (exotic strains)Exotic to AustraliaExotic to Australia: One key virus, cucumber green mottle mosaic…
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