• Martin, S. Clark
  Columbia Forest Research Center
  
• Rogers, Nelson F.
  Columbia Forest Research Center
  

Oil solutions of 2, 4, 5-T in low, single-hack frills are more effective than waist high notch girdles for killing unwanted hardwood trees. In a recent study in Missouri, 2, 4, 5-T in frills killed 75% of the trees smaller than 5 inches DBH, but waist-high notch girdling killed only 10%. Comparable kills on trees larger than 5 inches DBH were 65% for 2, 4, 5-T and 41% for girdling. All trees were treated in March.

The main advantages of 2, 4, 5-T in low frills over waist-high notch girdling are: (1) higher percentage kill, especially on small trees, (2) Year-round effectiveness, (3) less danger to personnel from ax injuries, and (4) little if any additional cost (limited time studies indicate that the labor saving in the 2, 4, 5-T treatments will about pay for the herbicide and oil.