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 moth pests that may also be present as larvae in buds early in the season such as filbert leafroller, obliquebanded leafroller and eyespotted budmoth.

Management-chemical control: HOME USE

  • Bacillus thuringiensis var. kurstaki-Some formulations are OMRI-listed for organic 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 quarts/A. 4F and 80S formulations are also available. PHI 14 days. REI 12 hr. Extremely toxic to aquatic invertebrates and bees.
  • 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.
  • fenpropathrin (Danitol 2.4 EC) at 10.3 to 21.3 oz/A. PHI 3 days. REI 24 hr. At least 50 gal (100 gal better) water for ground applications. Note buffer requirements for use near aquatic zones.
  • GS-omega/kappa-Hxtx-Hv1a (Spear-Lep) at 1 to 2 pints/A. Biological insecticide that should be tank mixed with equal parts of Bt. PHI 0 day. REI 4 hr.
  • methoxyfenozide (Intrepid 2F, generics) 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.
  • methoxyfenozide + spinetoram (Intrepid Edge) at 6 to 12 oz/A. Apply at initiation of egg hatch, if necessary reapply after 14-21 days, but not before 14 days. PHI 7 days. REI 4 hr. No more than 12 fl oz/A/season