How will I know if my chemical treatment worked?

We recommend you wait until winter or early spring (December through March) in the year following the treatment to inspect the branches for new, fresh, woolly “cotton balls” where the needles attach to the twig. If the adelgid nymphs begin feeding and there is no pesticide present, they will begin to fatten up into adults and will start putting on the white “wool” for which they are named. This is when they are easiest to observe. If you do not see the white wool by March, or only find a couple of “cotton balls”, then the treatment likely worked. You can also look for new foliage in the late spring, early summer. Healthy trees should have lots of new, bright green needles at the tips of the branches in the spring.