Douglas Fir Archives
Insects and diseases that can affect Douglas Fir (Pseudotsuga menziesii).
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Bagworms
Bagworm is a caterpillar that molts into a moth in the adult stage. They are easiest to identify by the bags they construct as they feed. Damage includes needle discoloration and injury.
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Cytospora Canker
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Diplodia Tip Blight
Diplodia (formerly Sphaeropsis) tip blight is caused by the fungus Diplodia pinea. It is the most common and severe disease of pines in Pennsylvania and attacks trees of all ages. Tips of infected current-year shoots will blight. Needles on these dead tips are usually tan to straw colored, shorter than normal, and typically remain attached.
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Rhabdcline Needle Cast
Douglas-fir is the only known host of Rhabdocline. Rhabdocline needle cast infection occurs around bud break, when buds are opening to expose susceptible immature needles
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Swiss Needle Cast
Like most other fungal diseases, Swiss needle cast favors rainy, moist, and cool weather. Fruiting bodies develop through the stomata.