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Diseases Caused By Basidiomycetes PowerPoint Presentation
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Diseases Caused By Basidiomycetes

Diseases Caused By Basidiomycetes

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Diseases Caused By Basidiomycetes

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Presentation Transcript

  1. Diseases Caused By Basidiomycetes

  2. Member of the order Uredinales Obligate biotrophs Multiple spore stages Heteroecious – needs two different hosts to comple life cycle Rusts with two or fewer spore stages – microcyclic rusts Rusts with more than two spore stages – macrocyclic rusts Rusts

  3. Rust Spore Stages Stage Host Produced On Nuclear Condition Basidiospores None N Spermatia Barberry N Aceiospores Barberry N+N Urediospores Wheat N+N Teliospores Wheat N+N & 2N

  4. Stem Rust of Wheat Puccinia graminis • World wide distribution • Macrocyclic, heteroecious rust • Spermatia and Aceia – barberry • Uredia and Telia – wheat • Secondary Cycle – urediospores

  5. Symptoms and Signs on Barberry Spermagonia Aceia

  6. Common Barberry - Susceptible

  7. Japanese Barberry - Resistant

  8. Uredia and Telia on Wheat

  9. Puccinia graminis – Life Cycle

  10. Stem Rust – Disease Cycle

  11. Cedar Apple RustGymnosporangiusm juniper-virginianae

  12. Symptoms and Signs of Cedar Apple Rust

  13. Life Cylce of G. juniper-virginianae

  14. Corn Smut Ustilago maydis

  15. Corn Smut • Smuts in order Ustilaginales • Most smuts attack ovaries of grains • Two types of spores by most smuts – teliospores and basidiospores • Dikaryotic mycelium

  16. Corn Smut - Symptoms and Signs

  17. Ustilago maydis– Life Cycle

  18. Rhizoctonia Sterile mycelium Damping off, stem cankers, root rots, foliage blights, brown patch of grasses, and web blights Target spot of tobacco Right angle branching of hyphae Has sclerotia

  19. Symptoms and Signs - Rhizoctonia

  20. Rhizoctonia solani – Life Cycle

  21. Brown Patch of Tall Fescue

  22. Identification of Signs and Symptoms • Look for “smoke rings” of fungal growth early while dew is own grass • Later look for large bleached lesions on leaf blades

  23. Brown patch of tall fescue • Favored by: • Hot, humid weather • High N fertilization • High shoot density • Full sun • Fungicides need to be applied prior to symptom development

  24. Southern Blight Sclerotium rolfsii

  25. Sclerotium rolfsii • Wide host range • Worst during periods of hot, dry weather • Plants die rapidly • Produces several toxins including oxalic acid • Organic matter, including mulch may make disease problem worst • Control – timing of fungicides and cultivation is critical

  26. Armillaria Root Rot Armillaria mellea

  27. Armillaria Root Rot • Usually attacks weaken trees • Soil inhabitant • Worldwide distribution • Suggested that old stumps be removed and wood from construction waste not be buried on sit

  28. Symptoms and Signs of Armillaria Root Rot

  29. Armillaria mellea – Life Cycle

  30. Test Warning:NOAA has issued a TEST WARNING for Sept. 20 at 10:10 am est. Please take appropriate precautions. TEST