|Cylindrocladium blight in a bed of softwood cuttings in late fall.|
|Closeup of orange fungal fruiting bodies on an infected cutting|
|Irregular-shaped spots on lower leaves of older rooted cuttings|
The disease is most often seen in propagation beds and pot yards that have grown vigorously and are too dense to allow proper air movement between plants. Spores of the fungus infect leaves and stems, and eventually kill entire plants. Often the root system is the last healthy part remaining. The phenomenon of plants dying in the center of a dense block, while those at the edge (with better air circulation) survive, is characteristic of this disease in dense beds of plants.
|Large area of dead plants in a propagation bed late in the season|
In pot yards and late-stage propagation beds where the plants have already formed roots, this disease is best managed by not over-watering or over-fertilizing plants, and by maintaining proper plant spacing so that the leaves and stems can dry between waterings. Cull to remove and discard any dead plants, and space the remaining plants out as much as possible so that there is good air movement between the bushes. Do not re-use any old used potting media, as this disease can carry over from one year to the next in contaminated soil or potting mix. Clean up as much debris as possible and sanitize the bed area and any pots that you plan to re-use.