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Additional index words. competition, crop tolerance, cultural weed control, Panicum miliaceum, morphological traits, wild-proso millet, yield loss Abstract. Knowledge of cultivar-specific information on crop tolerance, the ability of the crop to endure competitive stress from weeds, has garnered recent interest in organic crop production. Twenty-five commercial sweet corn hybrids from nine seed companies weregrowninthepresenceandabsenceofwild-prosomillet(PanicummiliaceumL.)to1) quantify tolerance in crop growth and yield to weed interference; 2) determine associations between tolerance in crop growth andyield; and 3) identify hybridsdiffering in toleranceto weed interference. Despite largedifferences incanopy architecture among hybrids, crop height and leaf uprightness were minimally affected by weed interference. In contrast, wild-proso millet interference reduced ear number 11% to 98% and ear mass 24% to 82% depending on the hybrid. The ability of a hybrid to make small growth adjustments in the presence of wild-proso millet appeared to haveno relationship to yield tolerance. The least competitive hybrids were 'ACX1413', 'Optimum', 'Quickie', 'Spring Treat', and 'Sugar Buns'. The most competitive hybrids were 'Code128', 'Coho','ElToro','EX8716622',and'Legacy'. Althoughsomeexceptionswere observed, in general, the longer-maturity processing hybrids were more competitive with wild- proso millet than the earlier-maturing fresh market hybrids.

Wild-Proso Millet Differentially Affects Canopy Architecture and Yield Components of 25 Sweet Corn Hybrids