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Q&A Home

Lois writes,
03/23/2011:

How do I figure the amount to treat hemlock trees for wooly adelgid?

Answer:

You will need to use 1.25 - 5.0 level teaspoons per inch of trunk diameter at breast height (DBH) 1.05 - 4.2 ounces per 10 inches of trunk diameter at breast height (DBH) For multi-stem trees, base rate on cumulative inches of diameter of all stems at breast height. Soil Drench: Mix required dose in water
and uniformly apply to soil around base of shrub or tree. Pull back mulch before drenching. For optimal performance, apply at least 1 quart of dilute solution per foot of height or inch of trunk diameter. If lower
drench volume is used, apply 1/2 inch of irrigation immediately after application to move product into root zone. Keep soil moist for at least 7 days after application.

How to find the DBH:

1. To find the diameter of the tree, measure the circumference of the tree four feet from the ground.  Use your tape measure to get accurate measurements from the ground to the four-foot mark and around the tree. 

The circumference of my tree is _____________________

     (include units)   

2.  Calculate the diameter of your tree:

 _________________ ÷  pi (3.14) = _____________________

    circumference                                  diameter (include units)

Answer last updated on: 03/23/2011

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