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FOLIAGE and TWIG DISEASES (caused by Ascomycete

FOLIAGE and TWIG DISEASES (caused by Ascomycete fungi) and some Basidiomycetes (rusts). Reading : Dreistadt et al. p 185-191, 193-194, 212-213 Edmonds et al. Chapter 13.

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FOLIAGE and TWIG DISEASES (caused by Ascomycete

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  1. FOLIAGE and TWIG DISEASES (caused by Ascomycete fungi) and some Basidiomycetes (rusts) Reading: Dreistadt et al. p 185-191, 193-194, 212-213 Edmonds et al. Chapter 13

  2. Mostly caused by Ascomycete fungi, but there are a few caused by bacteria and viruses (e.g., Camellia virus below). Abiotic causes (low and high temperatures, drought, air pollution, nutrition) are also important. General life cycle Ascomycote fungi Typically produce sexual ascospores in spring to infect new foliage and asexual spores (conidia) during the rest of the growing of the growing season. A few produce ascospores in fall. Both spore stages may not be produced.

  3. TYPICAL LIFE CYCLE OF AN ASCOMYCETE FUNGUS FOLIAGE DISEASE Asexual spores (conidia) produced in summer continue to infect leaves Leaves fall in autumn or retained on plant Sexual spores (ascospores) produced in spring as new foliage emerges Dead leaves overwinter

  4. Common foliage and twig diseases Dogwood anthracnose Sycamore anthracnose Cherry brown rot Rose black spot Conifer foliage diseases – Douglas-fir (Rhabdocline needle cast, Swiss needle cast) Pine needle casts. Rhododendron powdery mildew Poplar – shoot blight, rust Apple – scab and powdery mildew Azalea – powdery mildew Lilac – bacterial blight, Botrytis flower blight Peach – powdery mildew Winter injury – rhododendrons, pines

  5. Common angiosperm foliage diseases – black spot, tar spots, leaf spots, sooty molds, powdery mildews, etc. Also sycamore and dogwood anthracnose (infect leaves and twigs). Common conifer foliage diseases – needle blights or needle casts

  6. Discula sp. on C. nuttalii Dogwood Anthracnose Sycamore Anthracnose Apiognomonia sp. on Platanus

  7. Cherry brown rot in Arboretum – Monilinia fructicola and M. laxa

  8. Brown rot mummies

  9. SWISS NEEDLE CAST ON DOUGLAS-FIR Fruiting bodies (pseudothecia) plugging stomates Heavily infected tree with loss of foliage

  10. Elytroderma needle cast

  11. Dothistroma needle blight

  12. Rhododendron powdery mildew

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