Results showed that wild oats is an aggressive weed and reduces the grain yield of wheat even if present at density of one plant m-2 in wheat fields. However, the yield reduction is dependent on wild oat density i.e. higher the wild oats density, greater will be the yield losses of wheat. Presence of wild oats decreased all the yield components of wheat whereas the greatest reduction was recorded in tillers. It was concluded from the results of two years of experimentation that presence of wild oats density even at 1 m-2 caused substantial yield losses, hence it must be controlled to mitigate...