Abstract

CARDONA-PIEDRAHITA, Luisa Fernanda; CASTANO-ZAPATA, Jairo  and  CEBALLOS-AGUIRRE, Nelson. EPIDEMIOLOGY OF LATE BLIGHT (Phytophthora infestans(MONT.) DE BARY) IN FIFTEEN INTRODUCTIOS OF WILD TOMATO. rev.udcaactual.divulg.cient. [online]. 2016, vol.19, n.1, pp.45-54. ISSN 0123-4226.

Most of the genes responsible of resistance of tomato to fungi, bacteria, virus and nematodes, has been derivate from wild species of tomato. Hence, it is necessary to evaluate and identify promising wild genotypes to observe their reaction to the main pathological problems of cultivated species, in order to be considered in future programs of tomato production improvement. To reach this purpose, it is necessary to carry out epidemiological studies and evaluate wild introductions against tomato late blight caused by Phytophthora infestans, the most devastating disease worldwide. The study was conducted with fifteen wild tomato introductions at the Montelindo's farm of the Universidad de Caldas, in two production systems: free exposition and semi cover. Split plots was the experimental design used, being the main plots the production systems, and the subplots, the tomato introductions, with four replications. The evaluated variables were: severity (%), rate of disease development (r) and area under the disease progress curve (AUDPC) of late blight. In addition, the regression coefficients of the evaluated variables was calculated. Finally, an analysis of variance and Duncan's tests was conducted. According to the analysis, under the semi cover system the lowest numerical values for final severity, r and AUDPC, with 47%, 0.09 and 1,133, was obtained, respectively; standing out the introductions LA1480, IAC1686, LA2131 and LA2692. In the free exposition system the highest values of these parameters with 77%, 0.15 and 1,573, respectively, were obtained; however, the introductions LA1480 and LA2075 showed the lowest values under this production system.

Keywords : Chromista; phylogenetic resources; severity; solanaceae; rate of disease development; area under the disease progress curve.

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