Thickett, K., VanDerWal, J., Lovett-Doust, L. and Anderson, T. R. 2007. A method for screening soybean seedlings for resistance to northern stem canker caused by Diaporthe phaseolorum var. caulivora. Can J. Plant Sci. 87: 443-446. Five soybean varieties, Williams, Harosoy, AC Hime, Coles and Leo were inoculated 2 and 4 wk after planting with Diaporthe phaseolorum var. caulivora to determine if differences in resistance to stem canker could be detected in the early stages of plant development. Seedling stems were severed above the unifoliolate leaves and inoculum was applied to the cut surface. Stem lesion lengths were measured at 1, 2 and 3 wk following inoculation. The mean lesion length on seedlings inoculated 2 wk after planting (27.2 mm) was significantly less than seedlings inoculated 4 wk after planting (44.5 mm). Based on mean lesion length, Williams was the most susceptible variety followed by Harosoy. AC Hime, Coles and Leo were equally resistant. Stem canker development measured at 2 and 3 wk following inoculation was negatively correlated with stem moisture at the time of inoculation suggesting that stem moisture is important in the development and severity of stem canker. La tige des plantules a été tranchée au-dessus des feuilles à une foliole et l'inoculum appliqué à la surface coupée. Les auteurs ont ensuite mesuré la longueur des lésions 1, 2 et 3 semaines après le traitement. Les plantules inoculées 2 semaines après la plantation présentaient des lésions d'une longueur moyenne (27,2 mm) significativement plus faible que celles des plantules inoculées 4 semaines après la plantation (44,5 mm). Selon la longueur moyenne des lésions, Williams paraît la variété la plus sensible, suivie de Harosoy. AC Hime, Coles et Leo jouissent de la même résistance. Le degré de développement du chancre 2 ou 3 semaines après l'inoculation est négativement corrélé à la teneur en eau de la tige au moment du traitement, signe que ce paramètre revêt une certaine importance dans l'apparition de la maladie et sa gravité.
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