Wheat bunt
on all spikelets, showing the bunt (smut spore) they contain, which is larger than a normal kernel. The bunt balls are grey-brown. They rupture at harvest [...] contaminate healthy kernels, which in turn become a source of disease in the next season. Infection is strongly correlated to temperature and precipitation [...] tritici and Tilletia laevis only differ in one gene and easily hybridize. There is debate whether they should indeed be considered separate species, since they