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Harun Toksoz

Efficacy of sterol-inhibiting fungicides and SAR chemicals for control of black root rot of cotton in the absence and presence of nematodes. Harun Toksoz. Outline. Black root rot Sterol-inhibiting fungicides & SAR chemicals Objective Materials and methods Results Conclusions.

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Harun Toksoz

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  1. Efficacy of sterol-inhibiting fungicides and SAR chemicals for control of black root rot of cotton in the absence and presence of nematodes Harun Toksoz

  2. Outline • Black root rot • Sterol-inhibiting fungicides & SAR chemicals • Objective • Materials and methods • Results • Conclusions

  3. Black Root Rot • Caused by Thielaviopsisbasicola • Found in almost all major production areas • Pathogen has a host range of more than 230 species • Rarely kills plants • Causes stunting • Results in less vigorous plants • Delays flowering • Reduces yield

  4. Sterol-inhibiting fungicides and SAR chemicals Myclobutanil and triadimenol Triadimenol (Arthur, 1991) Myclobutanil (Butler et al. 1996) Bion (Acibenzolar-S-methyl) Mondal et al. 2005

  5. Effect of Bion on Disease Severity and Shoot Height B B A a b b (Mondal et al. 2005)

  6. Objective • Evaluate the efficacy of sterol-inhibiting fungicides and SAR chemicals alone and in combination on black root rot. • Systhane (Myclobutanil) • Bion (Acibenzolar-S-methyl)

  7. Materials and Methods • Artificially infested experiments • Controlled environmental experiments • Naturally infested experiments • Controlled environmental experiments • Field experiments

  8. Artificially Infested Experiments • Controlled environmental experiments • 15 °C night • 24 °C day • 14 h daylight period • Infested with • M. incognita (16 eggs per g soil) • T. basicola (100 chlamydospores perg soil) • Both pathogens • None • 15 different seed treatments • Terminate 28 DAP • 2 experiments

  9. Naturally Infested Experiments 1. Controlled environmental experiments • 7 different treatments • 4 replications • 3 different soils 2. Field experiments • 11 different treatments

  10. Data Collection • Disease assessments • % Root discoloration (0-10) • Hypocotyl discoloration (1-4) • Galling (on root system and tap roots) • Percent colonization (0-10) / incidence

  11. Results • Artificially infested experiments • Naturally infested experiments • Controlled environmental experiments • Field experiments

  12. Effect of seed treatments, artificially infested soil

  13. Effect of seed treatments, naturally infested soil; Tb+RN

  14. Effect of seed treatments, naturally infested soil; Tb+RKN

  15. Effect of seed treatments, naturally infested soil; Tb+RKN

  16. Effect of seed treatments, field experiment 2007

  17. Effect of seed treatments, field experiments

  18. Effect of seed treatments, field experiments

  19. Conclusions • Sterol-inhibiting fungicides are effective • Bion is effective • Population of pathogen • Plant growth, incidence…

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