question: <image 1> While the term "natural enemies" is often used to refer to insects that can decrease the population of pests, what about diseases that affect weeds? How should one handle weeds that have been infected by diseases?
  Options: A: Don't know and don't want to guess, B: Leave all the weeds so that the disease can spread to healthy weeds, C: Remove all weeds as they will impact on yield, D: The removal of the weed depends on the potential for the disease to spread to the crop