Abstract
Abstract: The objective of this work was to evaluate phytosanitary strategies for the chemical control of powdery mildew (Oidium mangiferae) in mango, based on the alternation of active ingredients with different modes and sites of action, and to determine the environmental and epidemiological conditions that favor the development of the disease. The experiment was conducted in Guerrero, México, in commercial orchards, within a program for the development of fungicide spraying strategies. Epidemic curves were used on temporal analyses of the disease for: incidence; area under disease progression curve (AUDPC); severity; and conidial seasonality and its relationships with meteorological parameters. The disease was better controlled with the application of systemic fungicide followed by contact fungicide with multisite activity. The first symptoms appeared 30 days after the issuance of shoots, and the most susceptible phenological (critical) stages were at full bloom and at the onset of fruit with 8-15 mm. Optimum conditions for the development of powdery mildew, which maximizes the density of airborne spores, are temperatures higher than 30°C and relative humidity over 90%.
Highlights
Mango (Mangifera indica L.) is the third most important tropical fruit worldwide, after banana (Musa sp.) and orange (Citrus sinensis L.)
The study was conducted during the 2011–2012 cycles, within a program of agronomic management (PAM) to control mango diseases
This program was supplemented with fungicide application strategies, based on the use of different active ingredients, modes of action, and spray timing, aimed to control O. mangiferae
Summary
Mango (Mangifera indica L.) is the third most important tropical fruit worldwide, after banana (Musa sp.) and orange (Citrus sinensis L.). México is the fifth producer worldwide and the first in exportation (FAO, 2016). Oidium mangiferae Berthet, the causal agent of powdery mildew in mango, is widely distributed throughout the Pacific region. The disease has been reported in many countries of Asia, Middle East, Africa, South Africa, America, and Oceania (Nasir et al, 2014). In México, the disease is widely distributed especially in the Pacific Coast and the severity has increased considerably in the last years (FélixGastélum et al, 2013).
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