A Decision Support System Based on Degree-Days to Initiate Fungicide Spray Programs for Peach Powdery Mildew in Catalonia, Spain
The incidence of peach powdery mildew (PPM) on fruit was monitored in commercial peach orchards to i) describe the disease progress in relation to several environmental parameters and ii) establish an operating threshold to initiate a fungicide spray program based on accumulated degree-day (ADD) data. A beta-regression model for disease incidence showed a substantial contribution of the random effects orchard and year, whereas relevant fixed effects corresponded to ADD, wetness duration, and ADD considering vapor pressure deficit and rain. When beta-regression models were fitted for each orchard and year considering only ADD, disease onset was observed at 242 ± 13 ADD and symptoms did not develop further after 484 ± 42 ADD. An operating threshold to initiate fungicide applications was established at 220 ADD, coinciding with a PPM incidence in fruit around 0.05. A validation was further conducted by comparing PPM incidence in i) a standard, calendar-based program, ii) a program with applications initiated at 220 ADD, and iii) a nontreated control. A statistically relevant reduction in disease incidence in fruit was obtained with both fungicide programs, from 0.244 recorded in the control to 0.073 with the 220-ADD alert program, and 0.049 with the standard program. The 220-ADD alert program resulted in 33% reduction in fungicide applications.
632 - Malalties i protecció de les plantes
American Phytopathological Society
Is part of
Marimon, Neus, Iban Eduardo, Joaquín Martínez-Minaya, Antonio Vicent, and Jordi Luque. 2020. "A Decision Support System Based On Degree-Days To Initiate Fungicide Spray Programs For Peach Powdery Mildew In Catalonia, Spain". Plant Disease 104 (9): 2418-2425. The American Phytopathological Society. doi/10.1094/PDIS-10-19-2130-RE.
Grant agreement number
INIA-FEDER/Programa Estatal de promoción del talento y su empleabilidad en I+D+I/RTA2013-00004-C03-01/ES/Estrategias de control de enfermedades fúngicas aéreas y de raíz en frutales mediterráneos, basadas en criterios epidemiológicos y en la utilización de micorrizas arbusculares/
Protecció Vegetal Sostenible
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