A “pine dieback tour” organized by OSU Extension Service of Union County will visit locations near Troy where ponderosa pines suffer from Diplodia pine shoot blight.

The tour, scheduled May 9 from 10 a.m. to noon, starts at the Wildcat Bridge, just upstream from Troy, and proceeds downriver to several locations, ending at Troy.

According to an Extension Service announcement, an increased amount of branch dieback has been noticeable in ponderosa pines along the Grande Ronde and Wallowa Valley fringes, including an especially hard-hit area along the Grande Ronde River near Troy. Crowns of afflicted trees may show either a few or numerous branches that have died.

The tour is open to anyone interested in learning more about Diplodia and its impact on tree growth and mortality. The tour may also cover other diseases and insects as they are found.

Participating specialists include USDA forest pathologists Brent Oblinger and Craig Schmidt, OSU forest health specialist Dave Shaw, ODF forest entomologist Rob Flowers, and USDA forest entomologist Lia Spiegel.

To register for the tour, contact the Extension Service office in Union County at 541-963-1010.

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