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Coneflower (Echinacea spp.)-Aster Yellows See: Aster- Yellows ...

Coneflower (Echinacea spp.)-Leaf Spots Cause The OSU Plant Clinic has found Alternaria sp. and Ulocladium sp. from leaf spot samples. Botrytis sp. was also found from necrotic leaves and stem lesions. White rust, Pustula sp. (formerly Albugo), has been re ...

Coneflower (Echinacea spp.)-Root and Crown Rots See: Coneflower (Echinacea spp.)- Stem Rot Cause The OSU Plant Clinic has found several soilborne organisms associated with Echinacea root problems but mostly Fusarium sp. and sometimes Pythium sp. or Rhizoc ...

Coneflower (Echinacea spp.)-Stem Rot Cause Sclerotinia sclerotiorum, a fungus that produces hard, black sclerotia, which can survive many years in soil. The disease de-velops in cool, wet conditions and is more prevalent when plants form a complete, compa ...

Camellia-Ringspot Disease See: Camellia- Variegation ...

Cedar, Incense-Pecky Rot Cause The fungus Postia amara caused an important stem decay of incense-cedar in Oregon. Airborne spores infect, through open wounds such as those from fire, large open knots, or broken branch stubs. Trees are particularly suscept ...

Cedar (All kinds)-Drought Injury See: Fir, True (Abies spp.)- Drought Injury Notes: Leyland cypress in the landscape is susceptible to drought problems at planting. Care in the first several years is often recom-mended to get them established. Since they ...

Cherry, Flowering (Prunus spp.)-Viruses See: Cherry (Prunus spp.)- Little Cherry Cherry (Prunus spp.)- Rasp Leaf Cause Numerous viruses and virus-like pathogens can cause problems in Prunus. Many of these pathgens are eliminated by intensive cleanup progr ...

Chrysanthemum-Septoria Leaf Spot Cause The fungi Septoria chrysanthemi has been reported from Washington and S. leucanthemi has been reported from Oregon and Washington. These fungi generally overwinter in plant debris and are favored by conditions that k ...

Cabbage and Cauliflower (Brassica oleracea)-Yellows (Fusarium Wilt) Cause Fusarium oxysporum f. sp. conglutinans) causes yellows of cabbage and other members of Brassicaceae. This fungus survives in soil as durable resting structures known as chlamydospor ...