Abstract
Citrus canker, caused by the bacterium Xanthomonas citri pv. citri (Xcc), is an endemic quarantine disease in northeastern Argentina. The objective of this study was to quantify the effect of weather variables on mid-season fruit canker intensity in an experimental grove of the “Red Blush” grapefruit cultivar in Bella Vista, Corrientes Province (Argentina), at two contrasting distances from a natural windbreak (closer, wd = 0; farther, wd = 1). For the 1991–2010 growing seasons, disease observations were analyzed at both windbreak distances. The variable that best correlated with the disease levels (S: severe, M: moderate and L: light) at both windbreak distances was DPrecWsBl (days with precipitation > 12 mm and wind speed > 2.6 km.h−1; Kendall Tau-b coefficient (rk) = 0.71), different from the rk = 0.60 obtained with DPrec (days with precipitation > 12 mm). Daily wind speed values at both windbreak distances were estimated from wind speeds recorded at Bella Vista meteorological station after fitting linear regression equations. The best ordinal response logistic regression models included DPrecWsBl and DT (days with temperatures in the interval 17–27 °C), and DPrec, DDMaxT (sum of the exceeding amounts of daily maximum temperature from 33 ºC) and windbreak distance (wd) coded as strong (wd = 0) and moderate (wd = 1) wind protection (prediction accuracy = 90 and 88.6 % respectively). Both models classified the nine observations with a severe canker intensity level correctly and their respective precipitation-driven predictors (DPrecWsBl and DPrec) achieved a highly satisfactory separation of two observed canker levels (S and M-L). The results may allow us to release canker risk warnings for scenarios with strong (wd = 0) and moderate (wd = 1) wind protection. These warnings may assist producers to make bactericide spray applications.
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Acknowledgments
We wish to thank many members of the EEA INTA Bella Vista. Mr J. Soliz, F. Hermosis and J. Benítez for participating in disease assessments. Mr A. Vallejos, V. Vallejos and H. Monzón for the installation and readings of Robinson anemometers. Mr J. Lugo and A. Almirón, responsible of the EEA INTA Bella Vista weather station
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Moschini, R.C., Canteros, B.I., Martínez, M.I. et al. Quantification of the environmental effect on citrus canker intensity at increasing distances from a natural windbreak in northeastern Argentina. Australasian Plant Pathol. 43, 653–662 (2014). https://doi.org/10.1007/s13313-014-0305-8
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DOI: https://doi.org/10.1007/s13313-014-0305-8