Start tracking only when you start seeing moths on your band. There are two ways you can track how many cankerworms are on your band.
Method #1: Count all the moths on the band.
This method works well if you only have a few moths.
Method #2: Estimate using squares
If the band is covered with moths, it may be easier to estimate them by using 3-inch square holes cut out of a piece of paper.
How do I estimate using squares?
Print out this template and cut out the three-inch squares provided. Place the paper in random places on the band and count how many moths are inside the holes you just cut out. The number of squares you use depends on the circumference of your tree.
Less than 31 inches - Use three squares
31 to 62 inches - Use four squares
More than 62 inches - Use six squares
Select different areas to count each week. To ensure you don't count the same moths twice, use a stick to mash or squish the moths.