Resumo

CASTANO MONSALVE, Julián; RAMIREZ GIL, Joaquín Guillermo; PATINO HOYOS, Luis Fernando  e  MORALES OSORIO, Juan Gonzalo. Management alternative for Phytophthora infestans (Mont.) de Bary in Solanum betaceum Cav. by resistance inducers. Rev. Protección Veg. [online]. 2015, vol.30, n.3, pp. 204-212. ISSN 2224-4697.

The tree tomato (Solanum betaceum Cav.) is an Andean fruit with wide perspectives for its commercial and industrial development. This fruit is consumed as both a fresh orprocessed product To search for crop sustainability, technological challenges must be confronted, among which pest management, which currently depends almost exclusively on fungicide and insecticide applications, stands out. Within the last two decades, the disease known as late blight or black pest appeared and notably spread causing large economic losses in several growing areas. The causal agent was identified as Phytophthora infestans sensu lato. Due to the disease importance and the high pathogen adaptability, the objective of the present study was to evaluate seven resistance inducers applied by spraying the soil or the foliage for this disease management. The potential phytotoxicity of these molecules was tested as well. None of the defense activators showed significant response when were applied to the soil. While foliar applications of potassium phosphite (0,75 ml.l^-1), sodium salicylate (0,4 g.l^-1), chitosan (3 mg.ml^-1) and hydrogen peroxide (1,0 mM) had no significant effect on lesion diameter or the area under the disease progress curve (AUDPC), BABA (1g.l^-1), methyl jasmonate (0,2 g.l^-1 ), and ASM (0,3 ml.l^-1) significantly reduced 7.7, 5 and 4.28 times the lesion diameter and 18, 5, 4,4 and 3.57 the AUDPC values, respectively.

Palavras-chave : Phytophthora infestans sensu lato; induced resistance; tree tomato.

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