Squash mosaic virus (SqMV) is a seed-borne pathogen which infect many Cucurbitaceae crops. Infection of SqMV has been reported from several vegetable growing areas in Indonesia. The objective of this research was to determine the percentage of seed-borne SqMV on five cucumber varieties i.e. 'Jupiter', 'Venus', 'Japan File', 'Vario', and 'Calista' and the effect of SqMV infection on mosaic disease development. Five cucumber varieties were mechanically inoculated with SqMV, followed by observation on symptom development, incubation period, and disease incidence. Seedborne virus was detected by Dot Immunobinding Assay (DIBA) and indirect Enzyme-linked immunosorbent assay (ELISA) methods following growing-on test. The plants showed varied symptoms including green mosaic, green-yellow mosaic, vein clearing, and fruit malformation. Disease severity and virus titer showed general trend, i.e. low during inflorescence period and increasing on fruiting period; with the exception on 'Japan File' which showed decreasing of disease severity since generative phase. All commercial seeds (F1) tested evidently infected by SqMV with high incidence (100%), whereas infection of SqMV on F2 seeds of 'Venus' reached 60.87%.
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