Competition BetweenPyrenophora tritici-repentisandSeptoria nodorumin the Wheat Leaf as Measured with de Wit Replacement Series

Competitive interactions between Pyrenophora tritici-repentis and Septoria nodorum were studied quantitatively by a modified plant ecology technique known as «de Wit replacement series». P. tritici-repentis and S. nodorum were inoculated alone and in various proportions together on wheat plants at anthesis. Mature leaves were harvested and incubated in moist chambers, after which fungal sporocarps were counted. For each inoculation mixture, the relative yield of each fungus (ratio of its sporocarp yield in the mixed inoculation to its sporocarp yield in single inoculation) was plotted against the proportion of that fungus in the inoculation mixture (...)