Black Root Rot Complex
Rhizoctonia fragariae, Cylindrocarpon spp., Pythium spp., and Fusarium spp.
2 host plants
Last updated
Roots develop black necrotic areas and decay. Use resistant rootstocks and well-draining soil. The pathogen (Complex of Rhizoctonia fragariae, Cylindrocarpon spp., Pythium spp., Fusarium spp., and Pratylenchus spp. (root-lesion nematodes)) favors moist conditions and enters through wounds or natural openings. You are most likely to see symptoms during the growing season when conditions shift between wet and warm. On susceptible hosts, the damage can progress quickly if left unchecked.
Plant certified stock on well-drained fertile soil adapted to strawberry production. While planting, keep roots from getting dry, and set plants at the proper depth.
Quick Reference
Management
Poor drainage and saturation; temperature stress; soil compaction; root injury; repeated strawberry planting; existing nematode populations; cool soil temperatures combined with high moisture
Cultural Controls
- Plant certified stock on well-drained fertile soil adapted to strawberry production.
- While planting, keep roots from getting dry, and set plants at the proper depth.
- Use long crop rotation in commercial plantings; include grasses and grains in the rotation.
- Preplant soil solarization has been helpful in reducing populations of certain soilborne pathogens and weeds in western Oregon.
- Place clear plastic (preferably anti-condensation film) directly on smooth, rototilled ground, which has been irrigated to field capacity and then allowed to drain for 1 or 2 days.
- Bury the edges of the plastic to trap the heat.