Phytophthora Root Rot and Stem Canker Found on Nordmann and Subalpine Fir in Norwegian Christmas Tree Plantations

Fig. 4. Canker symptoms caused by Phytophthora megasperma on the stem base of a seven-year-old subalpine fir (Abies lasiocarpa). The tree was girdled and dying (yellow foliage). Photo by V. Talgø.



Image from Plant Health Progress article:
Phytophthora Root Rot and Stem Canker Found on Nordmann and Subalpine Fir in Norwegian Christmas Tree Plantations