WSU Extension

Hortsense

Filbert
 
Disease
Bacterial blight 
Eastern filbert blight 
Powdery mildew 
Insect
Apple mealybug 
Brown marmorated stink bug 
Filbert aphid 
Filbert bud mite 
Filbert leafroller 
Filbertworm 
Lecanium scale 
Omnivorous leaftier 
Tent caterpillars 



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Caption: Leafroller larva and damage
Photo by: K. Grey
  
Filbert : Filbert leafroller
(revision date: 7/31/2017)


Biology
The filbert leafroller is a greenish caterpillar with a light to dark brown head. The caterpillars are about 3/4" long at maturity. They feed inside webbed or rolled leaves, typically near the shoot tip. They may also feed on buds. The adult moth is 1/2" to 3/4" across and has light brown to buff wings with darker markings. The filbert leafroller is also called the European leafroller and will also feed on apple, cherry, pear, and hawthorn.
Management Options


Non-Chemical Management
  • Pick out and destroy rolled leaves and nests with caterpillars, when practical.
  • Pinch rolled leaves to kill caterpillars.
  • Encourage natural enemies of caterpillars including birds, parasitic wasps and flies, and predacious beetles. Avoid use of broad-spectrum insecticides which kill beneficial insects.
Select non-chemical management options as your first choice!

Chemical Management

Apply in early spring when caterpillars are first noticed and before leaves are rolled. Apply Bt only when caterpillars are feeding. Use a spreader-sticker with liquid Bt formulations. Homeowners should not make foliar applications to trees over 10 ft tall. Consult a commercial pesticide applicator for treatment of trees and shrubs over 10 ft. tall.

Listed below are examples of pesticides that are legal in Washington. Always read and follow all label directions.
  • Azamax Botanical Insecticide, Miticide, & Nematicide [Organic]
    Active ingredient: azadirachtin  |  EPA reg no: 71908-1-81268
  • Bonide Thuricide BT Conc
    Active ingredient: Bacillus thuringiensis subsp. kurstaki  |  EPA reg no: 4-226
  • Bug Buster-O [Organic]
    Active ingredient: pyrethrins  |  EPA reg no: 1021-1771-54705
  • This list may not include all products registered for this use.
Images

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Caption: Leafroller larva and damage
Photo by: K. Grey
Caption: Leafroller pupa and damage
Photo by: K. Grey
Caption: Leafroller pupa
Photo by: K. Grey
Caption: Leafroller adult
Photo by: K. Grey
Caption: Leafroller damage
Photo by: K. Grey