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Southeastern Apple ProductionENTOMOLOGY |
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Obliquebanded Leafroller
Choristoneura rosaceana (Harris)
Description
Adult obliquebanded leafrollers (OBLR) are tan or brown moths with alternating light and dark bands on the front wings. Females are larger than males. Larvae are green with black or brown head capsules, and eggs are laid in overlapping masses similar to those of redbanded leafroller, but larger.
 Adult |
 Larva |
Life History
Partly developed OBLR larvae overwinter in cocoons in bark, becoming active around the time that buds open in the spring. They bore into the buds and may construct tubelike feeding chambers out of new leaves. As larvae mature, each will construct another tubular structure from a single large leaf, within which it will pupate. Adult moths appear 10 to 12 days later (usually by mid-May in the Southeast). This spring generation will deposit eggs on apple limbs and trunks within a few days, and first generation larvae hatch 10 to 12 days later. They feed on fruit or foliage until they mature by the end of June, becoming adults by mid-July. Larvae from these adults feed primarily on foliage until they are approximately half-grown. In cooler areas, they go on to produce the hibernacula in which they spend the winter; in warmer areas they may mature and produce a third generation to overwinter.
Damage
Foliage feeding in spring can be severe when OBLR populations are high, resulting in reduced growth (particularly in young nonbearing trees). Fruit feeding is similar to that of redbanded leafroller, but usually much deeper.
Monitoring and Control
Though widely distributed, OBLR is generally not a major pest in the Southeast. Pheromone traps should be used to determine when moths are flying, and sprays can be applied during the late flight period when eggs begin to hatch. Sprays applied for rosy apple aphid during trees' pink stage can reduce damage caused by overwintering larvae. In some areas OBLR has developed resistance to standard insecticides and may be better controlled by biological agents.
Insect and Mite Management Overview
Insect and Mite Index
Southeastern Apple Production Mountain Horticultural Crops Research & Extension Center 455 Research Drive Mills River, NC 28759 Phone: 828.684.3562 ~ Fax: 828.684.8715 Email: jim_walgenbach@ncsu.edu |
Web Crafters: Anne S. Napier and
Steve Schoof |
Updated March 9, 2007