• First hollow stem (FHS) is the growth stage when hollow stem can first be identified above the root system and below the developing head.
  
• FHS occurs when the developing head is still below the soil surface.
  
• Once FHS stage is reached in ungrazed wheat, continuously grazed fields will suffer dramatic grain yield reduction if grazing continues.
  

• There is no way cattle can make enough money in two weeks after FHS to recover losses from wheat incurred by grazing that two weeks.

First hollow stem stage of growth.