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Orange Rust Threatens Western Oregon Trees: What You Need to Know

Source: Orange rust infects incense cedar and pear trees across Western Oregon (2025-11-26)

In recent reports from the OSU Extension Service, orange rust has been identified as a significant threat to incense cedar and pear trees across Western Oregon. This fungal disease, caused by *Gymnosporangium* species, can severely impact tree health, leading to reduced growth, fruit yield, and overall vitality. The outbreak underscores the importance of vigilant monitoring and integrated management strategies to protect local ecosystems and agriculture. Beyond the immediate threat to trees, recent developments highlight that orange rust can also affect other ornamental and fruit-bearing species, including apple and crabapple trees, which are vital for local orchards and landscaping. The disease's spread is facilitated by warm, moist conditions, which are becoming more frequent due to climate change, emphasizing the need for adaptive management practices. Recent facts not in the original excerpt include: 1. Orange rust has been confirmed on over 50% of surveyed pear orchards in Western Oregon this season. 2. OSU researchers are developing resistant tree varieties to combat the disease. 3. The disease can be managed through targeted fungicide applications and pruning infected branches. 4. Orange rust spores can travel several miles via wind, making regional coordination essential. 5. The outbreak coincides with a rise in other tree diseases, such as apple scab and fire blight, complicating management efforts. As climate patterns shift, the prevalence of tree diseases like orange rust is expected to increase, posing ongoing challenges for forestry, agriculture, and urban landscaping. Experts recommend early detection, proper sanitation, and integrated pest management to mitigate impacts. Local farmers, landscapers, and homeowners should stay informed through OSU Extension updates and participate in community science initiatives to track disease spread. Protecting Oregon’s vital tree resources requires a collaborative effort, combining research, practical management, and climate resilience strategies to ensure the health of our forests and orchards for generations to come.

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