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Pine wilt disease: Pinewood nematodes that spread from infected to healthy pines in the spring cause the needles to turn yellow then reddish-brown.Red-band needle blight: Initial symptoms include dark green bands on the needles, which are quickly replaced with brown or reddish-brown lesions.Ploioderma needle cast: Symptoms appear in the winter and include yellow spots and bands that give the needles a mottled appearance.Phytophthora root rot: Signs of this disease include reduced or stunted growth, chlorotic or red-brown needles, needle loss, root decay, bleeding basal cankers, and eventually, the death of the tree.Amarillaria root rot: Symptoms include dark fungal rhizomes, resembling shoestrings beneath the bark, on the roots, and in the soil.Gall rusts: Damage includes shoot and branch injury.Spruce needle rust: Infected trees appear disfigured and have extensive needle discoloration.Christmas trees extensively grown in Pennsylvania include spruce, pine, and Douglas fir. Because there are many species grown for the Pennsylvania Christmas tree industry, there are many diseases you may have to manage. Common Christmas Tree Diseasesįungal pathogens and water molds are the primary cause of concern to the Christmas tree industry. Tips on integrated pest management for Christmas tree production are available too.

Use Penn State Extension’s extensive resources to learn about Christmas tree pests and diseases including pine shoot moth, pine sawfly, spruce gall adelgid, conifer seed bug, white pine weevil, and spruce spider mite. Growers must be able to identify the most common ones to assess the potential damage that each pest may cause. Various weeds, pests, and diseases can affect Christmas trees’ growth.