• Otvos, Imre S.
  Environment Canada - Forestry Service
  
• Clarke, L,J.
  Environment Canada - Forestry Service
  
• Durling, D.S.
  Environment Canada- Forestry Service
  

This report reviews the six eastern hemlock looper outbreaks that are known to have occurred in Newfoundland this century. The report give the periods of the outbreaks, size of the areas infested and the severity of the damage. It describes the chemical control operations conducted against the hemlock looper in 1968 and 1969. The natural control factores weather, avian predators, parasites and diseases and their effect in the population fluctuation of the hemlock looper are discussed. The report also reviews and summarizes the characteristics and pattern of looper outbreaks in Newfoundland.