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Control of Botrytis Diseases and Poinsettia Scab on Floral Crops

Control of Botrytis Diseases and Poinsettia Scab on Floral Crops. Dr. Mary Hausbeck Department of Plant Pathology Michigan State University. ARS Project Number: 1907-22000-016-02. Floriculture and Nursery Research Initiative Researchers Meeting. March 24-27, 2003. Botrytis cinerea.

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Control of Botrytis Diseases and Poinsettia Scab on Floral Crops

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  1. Control of Botrytis Diseases and Poinsettia Scab on Floral Crops Dr. Mary Hausbeck Department of Plant Pathology Michigan State University ARS Project Number: 1907-22000-016-02 Floriculture and Nursery Research Initiative Researchers Meeting. March 24-27, 2003

  2. Botrytiscinerea

  3. Botrytis Project Objectives • Determine role of environment in the disease cycle of Botrytis. • Develop production strategies for preventing and eliminating diseases caused by Botrytis on floriculture hosts. • Screen novel agents for potential to control Botrytis.

  4. Reduced Risk BAS 510 Decree* Compass* Heritage* Cabrio Actigard* Switch Biopesticides Endorse Bacillus lichenformis Bacillus subtilis* Mycostop* * Indicates greenhouse label Reduced Risk and Biopesticides

  5. Rate/100 gal 7-Day Spray Interval

  6. Rate/100 gal 14-day Spray Interval

  7. Rate/100 gal 14-Day Spray Interval 7-day

  8. Rate 100/gal 14-Day Spray Interval

  9. Rate 100/gal 14-Day Spray Interval Rate/100 gal 7-Day Spray Interval

  10. 7-day 7-day Rate/100 gal 14-Day Spray Interval

  11. Untreated Chlorothalonil 32 fl oz

  12. Endorse 2.2 lbs Untreated

  13. Untreated Decree 24 oz

  14. Summary • While industry standards such as chlorothalonil continue to provide excellent disease control, new reduced risk products products such as fenhexamid (Decree) and the strobilurins have been proven to be effective. • The biopesticide Endorse has shown potential in controlling Botrytis.

  15. Poinsettia Scab

  16. Objectives • Examine laboratory and greenhouse methods for the successful isolation, culture and inoculation of Sphaceloma poinsettiae. • Determine the role of the environment in the infection and spread of Sphaceloma poinsettiae. • Screen traditional and novel fungicides for the management of poinsettia scab. • Screen cultivars for resistance to poinsettia scab.

  17. Accomplishments • Methods have been found for the successful isolation and culture of Sphaceloma poinsettiae. Inoculum has been used for trials both at MSU and other facilities. • 57 cultivars have been screened for resistance to poinsettia scab. Although all cultivars have been found to be susceptible, differences were noted in the degree of infection among cultivars.

  18. Inoculum

  19. Spore Trapping and Environmental Monitoring

  20. Potential Value for Stakeholders and Technology Transfer • Information on the efficacy of fungicides and the environmental parameters that promote infection will help in the development of effective management tools for the industry. • Information will be disseminated through grower talks and publication in trade magazines and professional journals.

  21. Jeffrey Woodworth Blair Harlan Brian Cortright Sheila Linderman Nicholas Wendling Nicole Werner Bill Quackenbush Amanda Gevens Project Team Contributors to Research • Dr. Mary Hausbeck - Michigan State University • Dr. Steve Wraight - Cornell University, USDA-ARS

  22. Funding Sources • American Floral Endowment. • ‘Fighting Foliar Diseases Using Tools: Forcasters and Environmentally Friendly Fungicides.’ 2000-2002. $96,000. • Botrytis, Powdery mildew, Downy mildew • IR-4 ornamental trials on Botrytis. • 2002. $2,000

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