Kirt from Saratoga Springs, Utah writes
It's not holes or insect.
Per the label, to spray Southern AG Insecticides Liquid Copper Fungicide on trees: mix specified rate in 1 gallon of water and apply 3 gallons of mixed solution to a small tree, 6 gallons of mixed solution to a medium size tree, or 9 gallons of mixed solution to a large tree. The rate is 2 teaspoons per gallon of water but because Quaking Aspen Trees are not on the label, you will need to determine if this product can be used safely.
Answer last updated on: 04/10/2021