![]() ![]() See UW-Extension Bulletin A2620, or contact your county Extension agent. If you have established trees that are suffering from Dothistroma needle blight, remove fallen needles from around the base of these trees as these can serve as a source of fungal spores.įor more information on Dothistroma needle blight: Be sure to provide adequate spacing between trees to ensure good airflow and promote rapid needle drying. When planting new trees, make sure they are disease-free. Use white or Black Hills spruce, or white fir instead. How do I avoid problems with Dothistroma needle blight in the future?ĭo not plant Austrian pines as they are extremely susceptible to Dothistroma needle blight. Seedlings ( 40% of the crown affected) may not survive and should be removed. ![]() Manage this disease by maintaining good air circulation, mulching and preventing sprinklers from spraying needles. Severe infection for several years in a row can cause tree death. Young trees are more likely to suffer damage than older trees. Yard and garden Solve a problem Plant diseases Dothistroma needle blight Quick facts Dothistroma needle blight of pine trees causes needles to turn brown and fall off. The tip of the needle beyond the band eventually dies leaving the base of the needle alive and green. The spots become tan, yellow, or reddish-brown, and may encircle the needles to form bands. What does Dothistroma needle blight look like?ĭothistroma needle blight first appears as dark green, water-soaked spots on the needles. In Wisconsin, Austrian pines are most commonly and severely affected by this disease. Jim Olis* and Brian Hudelson, UW-Madison Plant Pathology *Completed as partial fulfillment of the requirements for a BS in Plant Pathology at the University of Wisconsin Madison.ĭothistroma needle blight is a common needle disease that can affect over thirty species of pine trees. Tan or brown needle tips (often with a distinct interface between dead and live tissue) that start as yellowish or reddish-brown spots, eventually forming a distinct band around needles dark fruiting bodies (acervuli) with olivaceous, elongate, curved, one- to five-septate conidia: Brown spot needle blight. Browning of needles typical of Dothistroma needle blight. ![]()
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