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 Lophodermium needle cast
Photo by: R.S. Byther
  
Pine : Lophodermium needle cast
(revision date: 4/23/2014)


Biology
Lophodermium needle cast is a fungal disease infecting the needles of pines. There are 19 Lophodermium species in the Pacific Northwest. One species of concern, L. seditiosum, infects current-season needles, which are killed by the next growing season. Yellow spots appear from late fall to spring. These later turn brownish, then whole needles turn reddish or yellow and drop by the following midsummer. Infected needles typically display black, football-shaped fungal structures with a slit in the center. Some species of pine also develop characteristic black lines across infected needles. Repeatedly infected trees may be stunted. Low branches are more severely affected. This disease may be confused with Lophodermella needle cast, which lacks the distinctive black, football-shaped structures.
Management Options


Non-Chemical Management
  • Reduce humid conditions which favor disease development (remove weeds under and near trees, thin canopy).
  • Space plantings to provide good air circulation.
  • Prune lower branches.
  • Prune and destroy infected twigs and branches.
Select non-chemical management options as your first choice!

Chemical Management

A minimum of 3 applications are required between late July and late September to control this disease. 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.
  • GardenTech Daconil Fungicide Conc
    Active ingredient: chlorothalonil  |  EPA reg no: 67572-82-71004
  • Ortho Max Garden Disease Control Conc
    Active ingredient: chlorothalonil  |  EPA reg no: 239-2522
  • This list may not include all products registered for this use.
Images

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Caption: Pine Lophodermium needle cast
Photo by: R.S. Byther
Caption: Pine Lophodermium fruiting bodies
Photo by: C.R. Foss
Caption: Pine Lophodermium needle cast
Photo by: R.S. Byther
Caption: Pine Lophodermium needle cast
Photo by: C.R. Foss
Caption: Pine Lophodermium needle cast
Photo by: R.S. Byther