Fruit Tree Leafroller
Ash, Caragana, Elm, Maple, Poplar and a variety of fruit trees
Appearance and Life Cycle
Fruit tree leafroller larvae emerge from overwintering eggs in late May. The larvae are green to brownish-green and have a light-brown to black head. By early July the larvae are full grown and are 20 to 25 millimetres (mm) in length. Adults are present throughout July. Their mottled forewings are light-brown to reddish-brown with silver markings. Females deposit 50 to 100 overwintering eggs in round masses on branches and twigs of host trees.
The young larvae cause damage by eating opening buds, blossoms, young fruit and unfolding leaves. Later they will roll and draw together several leaves by spinning a light web. The larvae are protected from predators and most insecticides while feeding within the folded leaves. If disturbed, they will
wiggle furiously backwards into the rolled leaves or drop to the ground. Generally, the fruit tree leafroller causes only light defoliation but in severe outbreaks large numbers of trees can be completely defoliated.
Chemical control of the fruit tree leafroller is not required for light infestations. During severe outbreaks, spray with carbaryl at the first sign of damage.
- Date modified: