Abstract
French bean rust incited by Uromyces appendiculatus is particularly prominent in pencil type beans in mid hills of Himachal Pradesh. Effect of different systemic, non-systemic and combi fungicides were studied for the management of bean rust. Under in vitro conditions azoxystrobin, difenoconazole + azoxystrobin, pyraclostrobin + metiram, kresoxim - methyl, fluopyram + tebuconazole, trifloxystrobin + tebuconazole, propiconazole + difenoconazole resulted in cent per cent inhibition of urediniospore germination at 200 ppm concentration. Difenoconazole + azoxystrobin provided up to 96 h post-infection activity while non-systemic fungicides i.e. mancozeb and chalorothalonil were found least effective with <24 h post -infection activity under glasshouse conditions. For the management under field conditions four foliar sprays of azoxystrobin (0.1%) at 10 days interval was found most effective in reducing bean rust severity to 3.81% and increased green pod yield by >100%. For effective management of this devastating disease activities of various fungicides (strobilurins and EBI’s) having different modes of action can be utilized in formulating a spray schedule.
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Acknowledgments
The first author gratefully acknowledges the help granted by ICAR- IIWBR Flowerdale, Chotta Shimla 101 002, H.P., and the Department of Plant Pathology, Dr. Y.S. Parmar University of Horticulture and Forestry, Nauni, Solan 173 230, Himachal Pradesh, India.
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Devi, B., Gupta, S.K., Singh, G. et al. Efficacy of new generation fungicides against French bean rust caused by Uromyces appendiculatus. Phytoparasitica 48, 535–543 (2020). https://doi.org/10.1007/s12600-020-00820-9
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DOI: https://doi.org/10.1007/s12600-020-00820-9