Bacteria as plant pathogens can cause severe economically damaging diseases, ranging from spots, mosaic patterns or pustules on leaves (Figure 5) and fruits, or smelly tuber rots to plant death.
Size of force or number of deaths does not necessarily equate to worst - the question is not what was the largest defeat nor was it what was the defeat with the most casualties. As such, I would suggest that the worst defeat in US military history was the Battle of Little Big Horn, or Custer's Last Stand - a hastily decided attack by Custer left his troops ripe for the picking by the Soux and Apache warriors.
This Day in History: 09/17/1862 - Battle of Antietam. In this This Day in History video, Robert E. Lee's bloody Civil War battle of Antietam is discussed. It occurred on 9/17/1862 and is considered the bloodiest one day battle in U.S. History.