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Gummy stem blight ( Didymella bryoniae  (Auersw.) Rehm) is one of the major cucumber diseases, causing the second highest loss of any disease in North Carolina. Published methods of screening for resistance to this fungus are poorly correlated with field resistance. The objective of this study was to develop seedling or detached-leaf screening methods that are correlated with field resistance. Seedling tests examined the effects of: seedling age (1, 2 or 3 true leaves), days in humidity chamber, inoculum concentration (1×10 5 , 1×10 6  or 1×10 7  spores per ml), time of inoculation (am vs. pm), fungal isolates, and cultigens. Detached leaf tests examined the effects of leaf age (1 st , 2 nd  or 3 rd  true leaf), inoculum concentration (1×10 4 , 1×10 5  or 1×10 6  spores per ml), and light levels during incubation (dark vs. 12h light/12h dark). Correlations between seedling tests and field data were moderate to high (r = 0.5 to 0.7). However, the coefficients of variation were also high. Correlations between detached leaf tests and field data were very low or negative.

SEEDLING AND DETACHED LEAF SCREENING METHODS FOR RESISTANCE TO GUMMY STEM BLIGHT IN CUCUMBER