The species Archips argyrospilus, Argyrotaenia velutinana and Choristoneura rosaceana are a few of the most significant species of leafrollers found in Canada. The three are severe pests to orchards and vegetable crops that result in direct damage through feeding on the fruit and the leaves. The red banded and fruit tree leafrollers are also known to infest numerous other species of plants, resulting in serious yield losses of marketable product.
The red banded leafroller is brown in color, has broad reddish bands on each forewing and is about the size of the codling moth. The larvae are green, slender and will reach a length of about 2 cm. The fruit tree leafroller is also a brown moth but is slightly larger than the codling moth. Thin light markings will appear in various patterns across the front wings. The larva is a slender worm, pale green in color. The head is black and a black spot will appear just behind the head. The larva may reach 2 cm in length before going to pupation. The oblique banded leafroller is a 3/4 inch long caterpillar that is greenish in colour with a black head. The adult moth is grayish brown with a wingspan of about 3/4 of an inch. The eggs are green and are often laid in branches and on rose leaves.
When scouting for leafroller there are two methods that can be implemented to determine whether control measures are necessary. One method is through the use of pheromone traps to determine the number of adult leafrollers present in a given moment. The other is simply a visual examination to detect the presence of live larvae. Determine the number of larvae per 100 leaves or fruit cluster, as well as the number of mature leafrollers present in pheromone traps. An average of only four larvae per 100 leaves or fruit clusters is usually considered a threshold.