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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References
Anonymous, 2009. Guideline for the efficacy evaluation of fungicides 1/31 (3) — Plasmopara viticola. European and Mediterranean Plant Protection Organization (EPPO).
Bartlett DW, Clough JM, Godwin JR, Hall AA, Hamer M & Parr-Dobrzanski B, 2002. The strobilurin fungicides. Pest Manag Sci 58, 649–662.
Cartolaro P, Pacreau S, Clerjeau M & Maurin G, 1993. Sensibilité des grappes au Black-rot. Proceedings of IOBC working group “Integrated control in viticulture”, Bordeaux, 03.-05.03.1993.
Ellis MA, Madden LV & Wilson LL, 1986. Electronic grape black rot predictor for scheduling fungicides with curative activity. Plant Dis 70, 938–940.
Gachomo EW, Dehne HW & Steiner U, 2009. Efficacy of triazoles and strobilurins in controlling black spot disease of roses caused by Diplocarpon rosae. Ann Appl Biol 152, 259–267.
Harms M, Holz B, Hoffmann C, Lipps HP & Silvanus W, 2005. Occurrence of Guignardia bidwellii, the causal fungus of black rot on grapevine, in the vine growing areas of Rhineland- Palatinate, Germany. BCPC symposium proceedings No. 81, 127–132.
Hoffman LE & Wilcox WF, 2003. Factors influencing the efficacy of myclobutanil and azoxystrobin for control of grape black rot. Plant Dis 87, 273–281.
Jailloux F, 1992. In-vitro production of the teleomorph of Guignardia bidwellii, causal agent of black rot of grapevine. Can J Bot 70, 254–257.
Jermini M & Gessler C, 1996. Epidemiology and control of grape black rot in southern Switzerland. Plant Dis 80, 322–325.
Kuo KC & Hoch HC, 1996. The parasitic relationship between Phyllosticta ampelicida and Vitis vinifera. Mycologia 88, 626–634.
Lorenz DH, Eichhorn KW, Bleiholder H, Klose R, Meier U & Weber E, 1995. Phenological growth stages of the grapevine, Vitis vinifera L. ssp. vinifera. Codes and descriptions according to the extended BBCH scale. Aust J Grape Wine R 1, 100–103.
Molitor D, 2009. Biologie und Bekämpfung der Schwarzfäule (Guignardia bidwellii) an Weinreben. Dissertation, Geisenheimer Berichte Bd. 65. Gesellschaft zur Förderung der Forschungsanstalt Geisenheim, Geisenheim.
Molitor D & Berkelmann-Löhnertz B, 2011. Simulating the susceptibility of clusters to grape black rot infections depending on their phenological development. Crop Prot 30, 1649–1654.
Ramsdell DC & Milholland RD, 1988. Black rot. In: Pearson RC & Goheen AC (Ed.) 1988: Compendium of Grape Diseases. APS Press, St. Paul, Minnesota. 15–17.
Schwabe WFS, Jones AL & Jonker JP, 1984. Changes in the susceptibility of developing apple fruit to Venturia inaequalis. Phytopathology 74, 118–121.
Scribner FL, 1886. Report on the fungus diseases of the grapevine. Washington Government Printing Office, Washington.
Spotts RA, 1977a. Chemical eradication of grape black rot caused by Guignardia bidwellii. Plant Dis Rep 61, 125–128.
Spotts RA, 1977b. Effect of leaf wetness duration and temperature on infectivity of Guignardia bidwellii on grape leaves. Phytopathology 67, 1378–1381.
Szkolnik M, 1981. Physical-modes of action of sterol-inhibiting fungicides against apple diseases. Plant Dis 65, 981–985.
Ullrich C I, Kleespies RG, Enders M & Koch E, 2008. Biology of the black rot pathogen, Guignardia bidwellii, its development in susceptible leaves of grapevine Vitis vinifera. J Cultivated Plants 61, 82–90.
Wilcox WF, 2008. Black rot news and reminders. Grape disease control, 2008. NY State Agricultural Experiment Station, Geneva.
Wilcox WF & Riegel DG, 1997. Evaluation of fungicide programs for control of black rot of grapes, 1996. Fungicide and Nematicide Tests 52, 874.
Wilcox WF, Riegel DG & Emele LR, 1999. Evaluation of fungicide programs for control of grape black rot, 1998. Fungicide and Nematicide Tests 54, 110.
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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