Potato ( Solanum tuberosum) and tomato ( Solanum lycopersicum) are important crops grown worldwide with a high nutritive value (Birch et al., 2012 Dias, 2012). Since phosphite can be provided at a lower price than conventional fungicides, it can reduce expenses for Ethiopian farmers with preserved late blight control. infestans in terms of radial growth, sporangium production and sporangium germination, which could affect the population structure. In vitro assays showed small differences in sensitivity to phosphite among five European and two Ethiopian isolates of P. Notably, phosphite was more effective against tomato late blight than against potato late blight, and gave the same protection as the fungicide in tomato. However, phosphite was not as effective as the fungicide under high disease pressure. Phosphite alone and in combination with reduced dosages of the fungicide Ridomil Gold™ (mancozeb 64% and metalaxyl-M 4% (w/w)) led to effective suppression of late blight in research plots and in farmers' fields under light-to-normal late blight pressure. In this study, field trials were conducted in a cool tropical highland of Ethiopia for three consecutive years to investigate the efficacy of phosphite alone and in combination with conventional fungicide against late blight in two potato cultivars and one tomato cultivar.
Late blight caused by the oomycete Phytophthora infestans is one of the most severe diseases of potato ( Solanum tuberosum L.) and tomato ( Solanum lycopersicum L.).
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