See:
Crabapple (Malus spp.) - Stem Rot
Note Although it has never been reported, the OSU Plant Clinic has found Phytophthora on samples of zelkova with root rot and stem cankers. Collar rots also seem to occur when trees are planted too deep.
See:
Crabapple (Malus spp.) - Stem Rot
Note Although it has never been reported, the OSU Plant Clinic has found Phytophthora on samples of zelkova with root rot and stem cankers. Collar rots also seem to occur when trees are planted too deep.