When the fruit tree leaf roller is present in large numbers in an apple orchard it i the most destructive apple insect in the state. Fortunately, it is not a pest of general occurrence. Tho this insect is known to occur from Cache Valley south to Beaver, serious losses from its ravages have been restricted to occasional orchards within the infested territory.
Hawley, I. M., "Bulletin No. 196 - The Fruit Tree Leaf Roller and Its Control by Oil Sprays" (1926). UAES Bulletins. Paper 161.