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Control of grey mould and stem-end rot in strawberry plants growing in a subtropical environment

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Abstract

The effect of different fungicide programs on grey mould (caused by Botrytis cinerea) and stem-end rot (caused by Gnomoniopsis fructicola) affecting strawberry plants (Fragaria ×ananassa cv. Festival) was studied in subtropical Australia over three years. The treatments involved a range of different synthetic multi- and single-site fungicides with different modes of action, a plant-defence promoter, plant extracts (lupin and rhubarb), organic acids, fatty acids, a salt, two strains of Bacillus subtilis, and single strains of B. amyloliquefaciens, Streptomyces lydicus and Trichoderma harzianum. Standard programs based on captan and thiram alternated, and applied with iprodione, fenhexamid, cyprodinil + fludioxonil, and penthiopyrad resulted in 3–4 % of unmarketable fruit compared with 25–38 % in the water-treated controls. There was no difference in the level of disease suppression when five or thirteen applications of single-site fungicides were rotated with the two multi-site fungicides. The incidence of unmarketable fruit was similar to the standard programs using isopyrazam (in 1 year out of 2), or penthiopyrad, fluazinam, chlorothalonil or thiram alone (in 1 year out of 1). The other fungicide programs were generally less effective. There were strong relationships between marketable yield and the incidence of unmarketable fruit over the three years (R2s = 0.82–0.93). A strategy based on thiram and captan applied alternately, with reduced applications of single-site fungicides is recommended and should reduce the chance of resistance to single-site fungicides becoming widespread in populations of the grey mould fungus. Although the program based on thiram alone had a similar incidence of unmarketable fruit as the standard program, repeated weekly applications of thiram are not recommended as they may cause unacceptable residues in the fruit. There were issues with some of the other fungicides due to phytotoxicity, residues, or difficulties with registering new fungicides that are in the same chemical group as currently registered products.

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Acknowledgments

We thank Horticulture Innovation Australia Limited and the Queensland Strawberry Growers’ Association for supporting this research, and Dr. Natalia Peres from the University of Florida for comments on the paper. The Queensland Government co-funded this research through the Department of Agriculture and Fisheries.

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  1. Department of Agriculture and Fisheries, PO Box 5083, SCMC, Nambour, QLD, 4560, Australia

    Christopher Michael Menzel, Apollo Gomez & Lindsay Alistair Smith

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  1. Christopher Michael Menzel
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  2. Apollo Gomez
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  3. Lindsay Alistair Smith
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Correspondence to Christopher Michael Menzel.

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Menzel, C.M., Gomez, A. & Smith, L.A. Control of grey mould and stem-end rot in strawberry plants growing in a subtropical environment. Australasian Plant Pathol. 45, 489–498 (2016). https://doi.org/10.1007/s13313-016-0440-5

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