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: Leaftier damage to leaf
Photo by: K. Grey
  
Filbert : Omnivorous leaftier
(revision date: 1/22/2016)


Biology
The omnivorous leaftier is the caterpillar of a bell-shaped tortricid moth. The small larvae tend to be quite active when disturbed, often wiggling vigorously backwards or dropping from the plant on a silk thread. The caterpillars tie foliage together with webbing and feed inside the protective nest. The omnivorous leaftier also commonly feeds on foliage and flowers of cultivated flowers including asters, heather, chrysanthemum, and gladioli, as well as on strawberry fruit and legumes. Female moths typically lay eggs on bark or rough wood.
Management Options

Non-Chemical Management
  • Hand-pick and destroy individual caterpillars or nests when practical.
  • Pinch to kill caterpillars inside rolled leaves.
  • 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 when caterpillars are present. Bacillus thuringiensis (Bt) will control caterpillars only if they are actively feeding. Use a spreader-sticker with liquid Bt formulations. NOTE: Carbaryl is toxic to bees. Do not apply products containing carbaryl on or near blooming plants. To minimize risk to bees, apply in the evening after bees have stopped foraging for the day. 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.
  • Bonide Thuricide BT Conc
    Active ingredient: Bacillus thuringiensis subsp. kurstaki  |  EPA reg no: 4-226
  • GardenTech Sevin Conc Bug Killer
    Active ingredient: carbaryl  |  EPA reg no: 264-334-71004
  • This list may not include all products registered for this use.
Images

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Caption: Leaftier damage to leaf
Photo by: K. Grey
Caption: Leaftier larva
Photo by: K. Grey
Caption: Leaftier larva and damage to daisy flower
Photo by: K. Grey
Caption: Leaftier adult
Photo by: K. Grey
Caption: Leaftier pupa
Photo by: K. Grey