Hazelnut-Omnivorous leaftier

Cnephasia longana

Pest description and crop damage European in origin, this pest has been present in Oregon since 1929. Adult female moths are grayish and mottled with brown spots. The male moth is grayish yellow. Larvae are a dirty yellow color. Larvae appear in early spring and roll and feed on leaves or inside buds. The larvae web leaves and flowers together and feed on developing buds, often resulting in destruction of the terminal growth. This pest can be a serious problem in young hazelnut orchards. Feeding on buds and early terminals can set back tree growth and can cause poor tree structure.

Pest monitoring Pry open buds at the time of bud break and look for larvae. Treat when you reach a 5% infestation level of buds checked. Compare with similar pests such as leafroller and eyespotted budmoth.

Management-chemical control: HOME USE

  • carbaryl

Management-chemical control: COMMERCIAL USE

  • Bacillus thuringiensis var. kurstaki-See label for rates. PHI 0 days. Apply with spreader-sticker. Some formulations are OMRI-listed for organic use.
  • carbaryl (Sevin XLR Plus) at 2 to 5 qt/a. 4F and 80S formulations are also available. PHI 14 days. REI 12 hr. Extremely toxic to aquatic invertebrates and bees.
  • chlorpyrifos-Generic labels for chlorpyrifos are also available.
  • chlorpyrifos (Lorsban 4E) at 3 to 4 pints/a. PHI 14 days. REI 24 hr. No more than three applications per season. This pest is a problem only on first- to third-leaf trees. More than one application may be required due to re-infestation. Extremely toxic to fish. Toxic to birds and wildlife.
  • chlorpyrifos (Lorsban 75 WG) at 2 to 2.67 lb/a. PHI 14 days. REI 24 hr. No more than three applications per season. This pest is a problem only on first- to third-leaf trees. More than one application may be required due to re-infestation. Extremely toxic to fish. Toxic to birds and wildlife.
  • chlorpyrifos/gamma-cyhalothrin (Cobalt) at 6.5 to 14.2 oz/100 gal (26 to 57 fl oz/a). PHI 14 days. Do not make more than 3 applications per season of Cobalt or other product containing chlorpyrifos for hazelnuts.
  • diflubenzuron (Dimilin 2L) at 12 to 16 fl oz/a. PHI 28 days. REI 12 hr. Extremely toxic to aquatic invertebrates. Do not apply within 25 ft of bodies of water.
  • diflubenzuron/lambda-cyhalothrin (DoubleTake) at 4 to 5 fl oz/a. PHI 28 days. REI 24 hr. Do not exceed 20 fl oz/a per growing season or 15 fl oz/a per year growing season post bloom. Extremely toxic to aquatic invertebrates. Do not apply within 25 ft of bodies of water, 150 ft if applied by air.
  • methoxyfenozide (Intrepid 2F, Troubadour 2F) at 0.12 to 0.25 lb ai/a. PHI 14 days. REI 4 hr. To control foliar-feeding leafroller larvae, apply when larvae are feeding. Most effective crop protection results from application when egg hatch begins. Do not exceed 24 fl oz/a per application or 64 fl oz/a (1 lb ai/a) per season. Do not apply within 25 ft of an aquatic habitat, 150 ft if applied by air.