Powdery mildew

R Rigidoporus ulmarius Rigidoporus ulmarius R Rigidoporus vinctus Rigidoporus vinctus R Rigidoporus zonalis Rigidoporus zonalis R Rikatlia Rikatlia R Rikatlia lungusaensis Rikatlia lungusaensis R Rind disease of sugar cane Phaeocytostroma sacchari R Rind stipple of grapefruit Environmental R Ring nematode Criconemella R Ring nematode Bakernema inaequale R Rinodina Rinodina R Rinodina gennarii Rinodina gennarii R Ripartites Ripartites R Roccella Roccella R Roccella canariensis Roccella canariensis R Roccella fuciformis Roccella fuciformis R Roccellaceae lichens Roccellaceae R Roesleria Roesleria R Roesleria root rot Roesleria subterranea R Roesleria root rot Roesleriaceae R Root smallpox disease Microbial rotting R Rootless corn syndrome Hot R Rose streak Rose streak R Rosellinia aquila Rosellinia aquila R Rosellinia desmazieri Rosellinia desmazieri R Rosellinia mammiformis Rosellinia mammiformis R Rosellinia root rot Rosellinia quercina R Rosellinia thelena Rosellinia thelena R Rosisphaerella leaf spot Rosisphaerella C Cercospora leaf spot of roses Rosisphaerella rosicola R Roussoella Roussoella R Roussoella hysterioides Roussoella hysterioides R Roussoellaceae Roussoellaceae R Rozites Rozites R Rubinoboletus Rubinoboletus R Rubroboletus Rubroboletus W Wolf bolete Rubroboletus lupinus R Rubus stunt Rubus stunt R Rugonectria Rugonectria B Bark necrosis of fruit trees Rugonectria rugulosa R Rugose leaf curl fungal R Rupestris stem pitting disease Grapevine rupestris R Russula Russula V Vinegar brittlegill Russula acetolens R Russula acrifolia Russula acrifolia B Blackened brittlegill Russula adusta G Green brittlegill Russula aeruginea B Blackening Russula Russula albonigra L Leather brittlegill Russula alutacea R Russula amoena Russula amoena C Charcoal brittlegill Russula anthracina P Purple brittlegill Russula atropurpurea G Golden brittlegill Russula aurea R Russula aurora Russula aurora B Blue Russula Russula caerulea G Green-flecked russula Russula chloroides C Charcoal Brittlegill Russula cyanoxantha R Russula delica Russula delica R Russula densifolia Russula densifolia T The sickener Russula emetica B Beech russula Russula faginea