Outline the various concerns a grower might consider before applying an herbicide in the following scenario, and what type of herbicide might be appropriate. Situation: A farmer has planted a pasture with bentgrass as a forage crop for a small herd of dairy cows and their calves. The farm is artisanal, but not fully organic. The clients are health conscious and concerned with the health and treatment of the animals. The farmer has noticed nightshade and mustard growing in the field. The nightshade can harm the grazing animals and taint the milk with solanine. The mustard can also taint the milk, changing its flavor. The farmer must decide whether to use herbicides on the field, and if so, what type.