lesions in spores are brown spot Corynespora cassicola produced occur on the stem, chlorothalonil fruits, petioles and leaves fruit surface is covered by a whitish mycelium and numerous sporangiophores; the fruits Phytophthora become brown-blackish and fruit rot and Phytophthora palmivora metalaxyl-M drop; firm dark brown lesions root rot appear on the roots and stem base; leaves wilt; roots develop a soft, wet rot. crown leaves develop yellow powdery Oidium caricae; Oidiopsis triadimenol; patches and white fungal growth; mildew taurica sulphur fruit shows circular white patches Yellowing and wilting of leaves; Pythium root spp. soft rot in the roots that may metalaxyl-M Pythium rot extend into the trunk old leaves turn yellow and then Viral/ yellow crinkle unknown phytoplasma dry and fall; juvenile leaves Phytoplasma develop a clawed appearance inner crown leaves become Candidatus Phytoplasma bunched and yellow then die; dieback australiense stem begins to die back from the top; fruit shrivels crown leaves turn yellow and mosaic unknown phytoplasma have shrivelled edges early symptoms include yellowing and vein clearing in young leaves and sometimes severe blistering and leaf distortion. Dark papaya ringspot virus (PRSV) concentric rings and spots or markings develop on the fruit which may turn tan-brown as the fruit ripens. necrosis of the tip and borders of young leaves; on green fruits, there is exudation of watery latex papaya meleira virus on the surface, which later becomes stained and darkened due to the oxidation of the latex * information taken from an InfoPest search, performed by GrowSearch Australia (Department of Primary Industries and Fisheries, Queensland) in September 2006; PaDIL (2005); OECD (2005); Walsh et al. (2006).
brown spot Corynespora cassicola lesions in spores are produced occur on the stem, fruits, petioles and leaves chlorothalonil Phytophthora fruit rot and root rot Phytophthora palmivora fruit surface is covered by a whitish mycelium and numerous sporangiophores; the fruits become brown-blackish and drop; firm dark brown lesions appear on the roots and stem base; leaves wilt; roots develop a soft, wet rot. metalaxyl-M powdery mildew Oidium caricae; Oidiopsis taurica crown leaves develop yellow patches and white fungal growth; fruit shows circular white patches triadimenol; sulphur Pythium root rot Pythium spp. Yellowing and wilting of leaves; soft rot in the roots that may extend into the trunk metalaxyl-M Viral/ Phytoplasma yellow crinkle unknown phytoplasma old leaves turn yellow and then dry and fall; juvenile leaves develop a clawed appearance dieback Candidatus Phytoplasma australiense inner crown leaves become bunched and yellow then die; stem begins to die back from the top; fruit shrivels mosaic unknown phytoplasma crown leaves turn yellow and have shrivelled edges papaya ringspot virus (PRSV) early symptoms include yellowing and vein clearing in young leaves and sometimes severe blistering and leaf distortion. Dark concentric rings and spots or markings develop on the fruit which may turn tan-brown as the fruit ripens. papaya meleira virus necrosis of the tip and borders of young leaves; on green fruits, there is exudation of watery latex on the surface, which later becomes stained and darkened due to the oxidation of the latex * information taken from an InfoPest search, performed by GrowSearch Australia (Department of Primary Industries and Fisheries, Queensland) in September 2006; PaDIL (2005); OECD (2005); Walsh et al. (2006).
biology-papaya2008.docx