Apple Disease - Nectria Twig Blight

Nectria twig blight, caused by the fungus Nectria cinnabarina, is a minor disease that breaks out occasionally.
Apple Disease - Nectria Twig Blight - Articles

Updated: October 18, 2017

Apple Disease - Nectria Twig Blight

The canker typically exhibits a few pink or coral fruiting structures of the fungus in mid-summer. Photo by S. Weikert.

Because its symptoms are similar to those of fire blight, growers need to be able to recognize it. The chemical controls used for fire blight would be wasted on nectria twig blight.

Symptoms

In early summer leaves and shoots of infected twigs wilt and turn brown. Close examination will show that a canker has girdled the twig at the point where shoots begin to grow. Most often this spot is located at the base of the previous season's cluster bud. Rome Beauty, characterized by enlarged cluster-bud bases, is very susceptible. In midsummer a few pink or coral fruiting structures of the fungus may appear in the cankered area.

Disease management

Since this disease hasn't been severe enough, no chemical control measures have been developed. The disease seems to be most prevalent during severe fire blight years since the fungus takes advantage of cankered areas, as well. The best management technique is to reduce inoculum by removing infected plant parts from the orchard.

Authors

Apple and pear diseases Peach, cherry, other stone fruit diseases Tree fruit disease management

More by Kari A. Peter, Ph.D.