Choristoneura  rosaceana

Pictures : Adults(male and female)    Larva

Description

Moths are reddish brown in color with two oblique bands on the forewings. The wingspread is about one inch. When at rest, with wings folded over the back, the moth's length varies from seven-sixteenth to five-eight of an inch. Eggs are light green and shingled so they overlap each other like fish scales. Young larvae are lemon yellow with black heads. Older larvae vary in coloration from gray to dark green. Full grown larvae measure about one inch long. The pupae are dark, reddish brown and usually are found in folded leaves.

Biology and Damage              

 

This pest has become a secondary pest of Oregon filbert orchards in USA. It feed on many other trees such as apples,pears,peaches, strawberries...  

The insect  overwinters as an inactive and partially grown larvae in cracks and crevices of tree bark and debris on the ground. In the spring as temperatures warm, the larvae become active and feed on buds and foliage. Pupation requires 4-6 weeks and usually occurs on the leaves. Adults emerge from early June through the middle of July. Egg laying begins a few days after adult emerge and eggs hatch within two weeks. Young larvae usually can be found in orchards by the first week of July and damage is evident by mid-July. Larvae feed and develop for 6 to 8 weeks depending on temperature. Pupation occurs inside silk webs and adults of the second generation emerge in 1 to 2 weeks. Second generation adults usually emerge from the first week of September through early October. Egg laid by these adults hatch in 7 to 10 days. Larvae feed for a brief period and then overwinter spring.

 

Larvae feed on leaves, but their primary damage is from feeding on the nut shell underneath the husk. This feeding causes scarring and staining of immature nuts and premature drop.

Common Names

USA: Obliquebanded Leafroller.