Foot and root rots of wheat in Australia The influence of the combined action of Fusarium culmorum Sacc. and Urocystis tritici Koern. on the occurrence of seedling blight
Jour Counc Sci And Indust Res Australia 6(4): 269-278
Seedling blight was exceptionally prevalent during 1930-33 at Canberra on wheat grown in a green house in unsterilized soil from grain inoculated with U. tritici in tests for varietal resistance to flag smut. Isolations from the affected plants yielded Fusarium spp., generally F. culmorum and Helminthosporium sativum or both. Plants grown from grain inoculated with F. culmorum, or in soil inoculated with H. sativum in an adjoining greenhouse, were less severely and less con sistently attacked. More seedling blight occurred when grain was inoculated with a mixture of spores of U. tritici and F. culmorum than among plants grown from grain inoculated with either organism alone, both in the field and in pots, with either sterilized or unsterilized soil. Comparatively little seedling blight occurred under the same environmental conditions among plants from grain inoculated with only F. culmorum or U. tritici. Under field conditions, vars. highly resistant to U. tritici were only relatively resistant to seedling blight caused by the combined attack of the 2 organisms acting to gether. This resulted in poor stands.