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Protective and curative grape black rot control potential of pyraclostrobin and myclobutanil

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Abstract

Strobilurin or triazole type fungicides have proven to be very effective in strategies to control grape black rot (causal agent: Guignardia bidwellii) due to their combined protective and curative activities. However, differences in their long-lasting protective capacity or in the limitation of the time frame for curative treatments have not yet been clearly described regarding this pathogen. To address these issues, trials with artificial inoculation were conducted using one representative of each group, pyraclostrobin and myclobutanil on leaves of potted vines as well as on berries of field grown vines. It could be demonstrated that pyraclostrobin possesses excellent pre-infection as well as post-infection activities on both, leaves and berries. Post-bloom, pyraclostrobin was able to completely inhibit infections on berries up to three weeks after application. Full curative control of developing black rot infections was achieved for up to 85% of the total incubation period. Myclobutanil turned out to be of limited protective activity. If applied the day prior to inoculation, the efficacy level reached around 90% but decreased continuously with increasing temporal distance between application and inoculation. However, curative applications of myclobutanil in the first half of the incubation period completely prevented symptom development on leaves as well as on berries. Due to their combined reach-back and forward activity to control black rot, both, pyraclostrobin as well as myclobutanil can be recommended in practical viticulture, especially in the most susceptible period between flowering and berries beginning to touch. Pyraclostrobin offers an exceptional protective and long-lasting curative potential, whereas myclobutanil is most effective in post-infection use.

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Molitor, D., Baus, O. & Berkelmann-Löhnertz, B. Protective and curative grape black rot control potential of pyraclostrobin and myclobutanil. J Plant Dis Prot 118, 161–167 (2011). https://doi.org/10.1007/BF03356399

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  • DOI: https://doi.org/10.1007/BF03356399

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