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Photo by P.J. Perea/NWTF
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Hack and Squirt
Hack and squirt or frill treatment is a simple method of killing trees with herbicides.
It is best suited to trees at least four to five inches in diameter. Bark on larger trees is often too thick for most water soluble sprays to penetrate, so it is necessary to provide a direct pathway for herbicide entry into the plant's vascular system.
Use a hatchet to make a series of downward cuts in the bark around the entire circumference of the tree trunk. For most species, it takes about one cut for every two inches of trunk diameter. Frill cuts are overlapping cuts in the tree bark around the stem. Immediately apply the selected herbicide into the cuts. Avoid application during heavy upward sap flow in the spring, when sap flowing out of the wound will prevent good absorption.
Apply herbicides registered for this purpose undiluted or in dilution ratios from one-half to one-quarter strength. Read the product label to determine the appropriate dilution. Amine formulations of Garlon, Grazon, and 2,4-D are generally more effective than esters. Roundup undiluted or half-strength is excellent for hack and squirt applications.
It is important when using a herbicide or any pesticide to follow the “Directions for Use” on the manufacturer’s label. Training in pesticide application is recommended for anyone who applies their own pesticides. Check with your local Cooperative Extension offices for more information.
Hack-and-Squirt |
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Imazapyr |
6 oz/gal |
One hack per 3 inches of diameter at breast height (DBH). |
Triclopyr |
50% |
One hack per 3 or 4 inches DBH. Apply 0.5 ml undiluted herbicides or 1 ml of 50% solution in water. |
Hexazinone |
100% |
One hack per 4 inches DBH. Use undiluted herbicide. |
Glyphosate |
50% |
1 ml per 2 or 3 inches DBH, applied below the branches. For larger trees, best results are observed from applying glyphosate in a continuous frill around the stem. |
Courtesy of www.aces.edu.