Pagoda dogwood dying
I planted this tree once and it died because of some canker disease, someone told me. I liked it so much, we thought we’d try again but this one is dying now too ! Do you have any ideas why we would have two trees die? Is this canker in the soil???
We couldn't find any evidence that the canker disease (Cryptodiaporthe corni) that often affects pagoda dogwood trees is soil borne, so replanting at or near the location of the first affected tree would not in itself account for the failure of the second one. However, unfavorable growing conditions at the planting site may favor the development of this disease. Pagoda dogwood grows best in partial shade with moist, fertile soil. The soil should also be acidic and well drained.
The following excerpt from a University of Minnesota publication may help you determine whether the canker disease is actually affecting your tree:
"This disease is readily identifiable by the yellow to orange color of cankered stems as well as bright orange pycnidia bursting through lenticels (Redlin & Rossman, 1991). Stems of all sizes can succumb to the disease, which can devastate the plant. Often starting at the tips of branches, the disease continues to move down the stem until it reaches a branch attachment or node. Commonly the advancing lesion can progress past branch nodes, move into the main stem, and kill the entire plant.
There is little known about the etiology and epidemiology of golden canker of pagoda dogwood. Without an understanding of this basic biology and ecology, it is difficult to make management suggestions. A previous publication has suggested that golden canker is likely a stress related disease (Redlin and Rossman, 1991)."
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