TLC is needed when planting dogwood trees this spring. Recent study indicates canker infection ( Collar Rot / Phytophthora cactorum) frequently occurs through injuries caused during transplanting, lawn care (mowing injuries) and soil cultivation in the root zone!This disease causes injury to flowering dogwood (Cornus florida) and may kill the affected tree or weaken the tree and make it more susceptible to attack by other organisms.
The first symptom noticed is usually a reduction in the number and size of leaves. The leaf color is lighter than normal during the summer and in late summer the leaves turn prematurely yellow or red and drop early. Affected trees in the later stages of the disease may produce an abnormally large number of flowers and fruits. During dry times in summer, diseased dogwoods are much more likely than healthy trees to have large numbers of leaves curl or shrivel or to show wilting of all foliage. Affected dogwoods exhibit gradual dieback of twigs and branches, sometimes starting only on one side of the tree, but eventually ending in death of the entire tree.
Dogwood-Missouri’s State Tree…
Always a favorite, the Flowering Dogwood is a frequently requested selection yet a success challenge. Studies have been done to determine how this native tree of Missouri might be able to adapt to a cultivated situations. MLNA would like to share your positive experiences and recommendations. We wish to increase everyone’s success level, reduce tree loss and educate our professionals. Please share your comments and information with maryannfink@mlna.org . Watch in upcoming newsletter for follow up contributions about care and management practices for this favored tree. For more information about this research visit: http://plantclinic.cornell.edu/FactSheets/collarot/collarot.htm
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