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  • This material is based upon work that is supported by the National Institute of Food and Agriculture, U.S.

    Department of Agriculture, under award number 2015-34383-23710 with substantial cooperation and

    support from the State Agricultural Experiment Stations and USDA-ARS.

    http://www.ir4project.org/about-environmental-horticulture/environmental-horticulture-research-

    summaries

    IR-4 Ornamental Horticulture Program Botrytis Efficacy & Literature Review

    Botrytis cinerea Botrytis elliptica

    Botrytis paeoniae Botrytis tulipae

    Authors: Ely Vea and Cristi Palmer Date: November 27, 2017

    Acknowledgements Susan Bierbrunner

    http://www.ir4project.org/about-environmental-horticulture/environmental-horticulture-research-summarieshttp://www.ir4project.org/about-environmental-horticulture/environmental-horticulture-research-summaries

  • 2

    Table of Contents

    Table of Contents ............................................................................................................................ 2 Table of Tables ............................................................................................................................... 4 Table of Figures .............................................................................................................................. 6 Abstract ........................................................................................................................................... 7 Introduction ..................................................................................................................................... 8

    Materials and Methods .................................................................................................................... 8 Results ........................................................................................................................................... 12

    Comparative Efficacy for Botrytis cinerea ............................................................................... 12 Begonia ................................................................................................................................. 12 Geranium .............................................................................................................................. 12

    Lisianthus .............................................................................................................................. 28

    Pansy ..................................................................................................................................... 28 Miniature Rose ...................................................................................................................... 30

    Poinsettia .............................................................................................................................. 32

    Primrose ................................................................................................................................ 35 Chrysanthemum .................................................................................................................... 35

    Douglas Fir ........................................................................................................................... 36 Rose ....................................................................................................................................... 41 Western Hemlock .................................................................................................................. 41

    Comparative Efficacy for Botrytis elliptica .............................................................................. 44 Comparative Efficacy for Botrytis paeoniae............................................................................. 48

    Comparative Efficacy for Botrytis tulipae ................................................................................ 56 Efficacy Summary by Product/Active Ingredient ..................................................................... 61

    Azoxystrobin. ......................................................................................................................... 61

    Azoxystrobin + Difenoconazole. ........................................................................................... 61

    Bacillus amyloliquifaciens strain F727. ............................................................................... 61 Bacillus subtilis. .................................................................................................................... 61 Azoxystrobin + Benzovindiflupyr. ......................................................................................... 61

    Chlorothalonil. ...................................................................................................................... 61 Chlorothalonil + Thiophanate methyl. ................................................................................. 61

    Copper Products. .................................................................................................................. 61 Cyprodinil + Fludioxonil. ..................................................................................................... 62 Fenhexamid. .......................................................................................................................... 62 Fenpyrazamine. ..................................................................................................................... 62 Fludioxonil. Medallion ......................................................................................................... 62

    Fluoxastrobin. ....................................................................................................................... 62

    Fluxapyroxad + pyraclostrobin. ........................................................................................... 62

    Gliocladium catenulatum ...................................................................................................... 63 Hydrogen dioxide + peroxyacetic acid ................................................................................. 63 Iprodione. .............................................................................................................................. 63 Isofetamid. ............................................................................................................................ 63 Lupinus extract...................................................................................................................... 63

    Mandestrobin ........................................................................................................................ 63 Metconazole .......................................................................................................................... 63 Polyoxin D. ........................................................................................................................... 63

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    Potassium bicarbonate.......................................................................................................... 63 Pyraclostrobin....................................................................................................................... 63 Pyraclostrobin + Boscalid. ................................................................................................... 63

    Reynoutria sachalinensis extract. ......................................................................................... 64 SP2770. ................................................................................................................................. 64 SP2773. ................................................................................................................................. 64 Tebuconazole. ....................................................................................................................... 64 Thiophanate methyl. .............................................................................................................. 64

    Thyme Oil. ............................................................................................................................. 64 Trifloxystrobin....................................................................................................................... 64 Triticonazole. ........................................................................................................................ 64 Ulocladium oudemansii strain U3 ........................................................................................ 64

    Phytotoxicity ............................................................................................................................. 64

    Appendix 1: Contributing Researchers ......................................................................................... 84

  • 4

    Table of Tables

    Table 1. List of Products and Rates Tested on Ornamentals from 1998 to 2016. ...................... 8 Table 2.* Efficacy for Botrytis cinerea on Begonia (Begonia sp.) Doublet Pink, Buck, GA,

    2007............................................................................................................................. 12 Table 3. Efficacy for Botrytis cinerea on Geranium (Pelargonium x hortorum) 'Lavender',

    Hausbeck, MI, 2000. ................................................................................................... 13

    Table 4. * Efficacy for Botrytis cinerea on Geranium (Pelargonium x hortorum) 'Lavender', Hausbeck, MI, 2000. ................................................................................................... 13

    Table 5. * Eff

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