Northwest berry Foundation

Management Detail

Leafroller, Orange tortrix

in Raspberries

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Latin name: Argyrotaenia franciscana

Description:

Reason for Concern:
1) Major crop contaminant in Oregon and SW Washington blackberries.
2) Damage from webbing/feeding on foliage is not economic.

Identification/Symptoms
The larvae are light brown to yellow green with a brown head. Full grown larvae are ¾-inch long, but can be as small as a 2-3 mm. When disturbed, they wiggle backwards and drop to the ground on a silken thread. Rolled leaves webbed together form a protective nest indicating the presence of leafroller larvae. Adult moths are tan or gray with darker mottling on the forewings.

Life Cycle:
Overwintering in canes and dried leaves, larvae may feed during winter warm periods, but become active in spring. Adult moths emerge in late spring to lay eggs. Hatch of 1st summer brood often coincides with harvest and therefore contaminates fruit. There are 3 or 4 overlapping generations a year.

Links:

Scouting:

  • Place pheromone traps in fields beginning in late April or May and check weekly. Change lures every 28 days and trap bottoms when debris (organic material) limits the usefulness of the trap. Count and record. Scrape trap bottom and note date on trap when bottoms and lures are changed.
  • As the pheromone attractant for Orange Tortrix and Obliquebanded Tortrix is very similar, it is necessary to distinguish between the two while trapping. Orange Tortrix is considerably smaller than the Obliquebanded, and the Obliquebanded generally has much thicker, more pronounced, diagonal lines across its wings. Carnation Tortrix will also sometimes be caught and is easily discernible by its bright orange coloring on the underside of its wings.
  • About a week after peak flight, begin scouting for larvae using a beating tray in several random locations throughout field. The Orange Tortrix larva will appear light brown to yellow green, and will appear full grown at ¾” (2-3cm) long. When agitated, it will wiggle vigorously backwards and drop to the ground on a silken thread. Orange Tortrix larvae differ from Obliquebanded larvae in that the Orange Tortix larvae will have a much lighter colored head than Obliquebanded which has a brown or black head.
  • Search 10 leaf tips in at least 4 areas of the field for indication of larvae (rolled leaf often at tip of canes). Identify, record number and destroy. Change areas per visit in order to cover field.
  • Leafrollers are a minor pest in blueberries, however, there may be low tolerances for blueberry exports to certain countries.

 
Cultural Controls:

None listed at present.

 

For information about chemical controls, check with our Pesticide Guide.

images


photo by K. Gray


Orange tortrix, left, obliquebanded, right - photo by T. Peerbolt


photo by E. LaGaza


Typical rolled leaf - photo by T. Peerbolt


Typical rolled leaf - photo by T. Peerbolt


Leafroller pupae - photo by T. Peerbolt


Leafroller larva being consumed by parasitoid wasp larvae - photo by T. Miller


Leafroller trap - photo by T. Peerbolt

 


Leafroller adults in trap - photo by T. Peerbolt


Left over leafroller head capsule. The parasite is in the coocoon. - photo by T. Peerbolt


Leaf rolled by leafroller larvae. - photo by T. Peerbolt


Leaf rolled by leafroller larvae. - photo by T. Peerbolt


Leaf rolled by leafroller larvae. - photo by T. Peerbolt

 

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