Resumo

HUERTA-PALACIOS, Graciela; HOLGUIN-MELENDEZ, Francisco; BENITEZ-CAMILO, Flor Azucena  e  TOLEDO-ARREOLA, Jorge. Anthracnose Epidemiology [Colletotrichum gloeosporioides (Penz.) Penz. And Sacc.] on Mango cv. Ataulfo (Mangifera indica L.) in the Soconusco, Chiapas, Mexico. Rev. mex. fitopatol [online]. 2009, vol.27, n.2, pp.93-105. ISSN 2007-8080.

The present study is aimed to describe the anthracnose fluctuation caused by Colletotrichum gloeosporioides on Ataulfo mango foliage and its relationship with host shoot development and caught conidia quantity, under the climatic conditions from the Soconusco, Chiapas, Mexico. The study was performed from December 2001 to September 2002. The results indicate that the disease increases throughout the year, affecting young and mature leaves with a random distribution pattern into the canopy. The greatest disease increase was observed from December to April, with a similar growth rate between young (0.016) and mature (0.015) leaves. A multiple regression analysis revealed that the most correlated climatic parameters with disease severity were the minimal Temperature of Dew Point (mTDP) and the minimal Relative Humidity (mRH) with a positive and a negative correlation, respectively. Such variables explained 83% of the anthracnose development variations, as the common heavy rains on the region matched with the lowest incidence of the disease and explained only 25% of the variations. mTDP, with values ranging from 21 to 24°C during December and April enabled water condensation over leaves, flowers and fruit and enhanced the infection and dispersion of conidia dragging (tearing symptom) and splashing.

Palavras-chave : weather; host; spores trapping; relative humidity; temperature; pluvial precipitation.

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