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Field Validation of PBcast in Timing Fungicide Sprays to Control Phytophthora Blight of Chili Pepper
Res. Plant Dis. 2020;26:229-238
Published online December 31, 2020
© 2020 The Korean Society of Plant Pathology.

Mun-Il Ahn1,2, Ki Seok Do3, Kyeong Hee Lee4, Sung Chul Yun2* , and Eun Woo Park5,6*

1EPINET Co., Ltd., Anyang 14056, Korea
2Department of Life Science and Biochemical Engineering, Sunmoon University, Asan 31460, Korea
3NEXTON Co., Ltd., Seoul 05605, Korea
4Chungcheongbuk-do Agricultural Research and Extension Services, Ochang 28130, Korea
5Interdisciplinary Program in Agricultural and Forest Meteorology, Seoul National University, Seoul 08826, Korea
6National Center for Agrometeorology, Seoul 08826, Korea
E. W. Park
Tel: +82-33-333-2887
Fax: +82-33-333-2886
S. C. Yun
Tel: +82-41-530-2282
Fax: +82-41-530-2393
Received September 22, 2020; Revised October 31, 2020; Accepted October 31, 2020.
cc This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( by-nc/4.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Field validation of PBcast, an infection risk model for Phytophthora blight of pepper, was conducted through a designed field experiment in 2012 and 2013. Conduciveness of weather conditions at 26 locations in Korea in 2014-2017 was also evaluated using PBcast. The PBcast estimated daily infection risk (IR) of Phytophthora capsici based on weather and soil texture data. In the designed filed experiment, four treatments including routine sprays at 7-day intervals (RTN7), forecast-based sprays when IR reached 200 (IR200) and 224 (IR224), and no spray (CTRL) were compared in terms of disease incidence and number of sprays recommended for disease control. In 2012, IR had reached over 200 twice, but never reached 224. In 2013, IR had reached over 200 three times and once higher than 224. The RTN7 plots were sprayed 17 and 18 times in 2012 and 2013, respectively. Weather conditions throughout the country were generally conducive for Phytophthora blight and 3-4 times of fungicide sprays would have been reduced if the PBcast forecast information was adopted in the decision-making for fungicide sprays. In conclusion, the PBcast forecast would be useful to reduce fungicide applications without losing the disease control efficacy to protect pepper crop from Phytophthora blight.
Keywords : Chili pepper, Control efficacy, Disease forecast, PBcast model, Phytophthora capsici

December 2020, 26 (4)