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Spatial and Temporal Dynamic of Scab (Sphaceloma perseae Jenk.) on Avocado (Persea americana Mill)
Graciela Dolores Ávila Quezada, Daniel Téliz Ortiz, Gustavo Mora Aguilera, Humberto Vaquera Huerta, Leonardo Tijerina Chávez;
Revista Mexicana de Fitopatología 2003 21(2)
Resumen
Inglés Español
Spatial and temporal dynamics of scab was studied in a Hass avocado orchard in Michoacan, Mexico in 2000. Monthly severity assessments were made in 60 trees in 60 fruits per tree, by a logarithmic diagrammatic scale. Fifteen fruits were selected and labeled in each cardinal position in the lower part (1-3 m.) of each tree. Data were analyzed by indexes of dispersion, spatial lag autocorrelation, and geotopographics and isopaths maps. Aggregation of diseased trees was found for all evaluation dates. Spatial proximity patterns with significant correlation were detected at the beginning of the epidemic. Spatial lags autocorrelation analysis showed quadrats with significant correlation in the second month of the evaluation, there were no significant autocorrelations in the following months. The disease progressed in immature fruits, as the fruit was ripening, an asymptote in the disease progress curve was observed. The disease appeared in March, 30 days after the wind speed increased, when the monthly average temperature was between 13.7°C (Feb.) and 14.3°C (Nov.), and the relative humidity monthly average between 60% (Feb.) and 45% (Mar.). Final severity was low 0.82%, with apparent infection rate b-1 = 0.013. Disease incidence was directly related with thrips damage incidence. Scab incidence reached 97% and thrips damage incidence 90%. Both epidemics were statistically similar according to the splice of the confidence intervals (95%) of the c and b parameters.

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Universidad Autónoma del Estado de México
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