WSU Extension

Hortsense

Pine
 
Disease
Armillaria root rot 
Dwarf mistletoe 
Elytroderma needle cast 
Lophodermella needle cast 
Lophodermium needle cast 
Phytophthora root rot 
Western gall rust 
White pine blister rust 
Insect
Coneworms 
Eriophyid mites 
European pine shoot moth 
Mountain pine beetle 
Pandora moth 
Pine aphid 
Pine bark adelgid 
Pine butterfly 
Pine needle scale 
Pine needle sheathminer (Pine sheath miner) 
Sequoia pitch moth 
Spider mites 
White pine weevil 



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Caption: Pine sheath miner
Photo by: R.S. Byther
  
Pine : Pine needle sheathminer (Pine sheath miner)
(revision date: 3/10/2017)


Biology
Pine needle sheathminers are orange to tan larvae that feed on the needles. Young larvae mine inside needles, while older larvae feed at the base of needles inside the needle sheath. Damaged needles often droop or stick out from the stem at a sharp angle. Adults are silvery moths about 1/2" across. They lay eggs on the needles in early to mid-summer. Pine needle sheathminers attack species and hybrids of two- and three-needle pines and seem to prefer smaller trees.
Management Options


Non-Chemical Management
  • Prune and destroy heavily infested branch tips in early spring before overwintering larvae start to feed, when practical.
Select non-chemical management options as your first choice!

Chemical Management

The following should be applied in dormant stage. Sevin (carbaryl) is particularly dangerous to honeybees since it does not immediately kill them. They return to the hive with the poison and distribute it within. Therefore avoid carbaryl if there is any possibility of pesticide drifting onto nearby blooming plants. 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 Systemic Insect Control
    Active ingredient: acephate  |  EPA reg no: 239-2461-4
  • 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: Pine sheath miner
Photo by: R.S. Byther