Nectria Canker

Asked June 10, 2019, 1:53 PM EDT

Is there a treatment to use if we suspect Nectria canker on our locust tree? We're seeing holes, some of which go all the way through a branch. We would certainly like to not lose this tree from our courtyard.

Bernalillo County New Mexico

1 Response

Nectria canker is usually caused by the fungus Nectria galligena or Nectria cinnabarina. It usually attacks susceptible trees through a wound or areas that have been pruned during susceptible times.This particular disease is treated by pruning out the infected areas. The best time to prune is in late winter. Avoid pruning in the spring when there is more moisture or in late summer or fall which may delay cold hardiness. Use tools that are disinfected with a bleach mixture consisting of 1 part bleach to 9 parts water. Nectria canker may be prevented by keeping the trees watered during dry periods and using a mulch around the base of the tree. When adding mulch, avoid putting it in direct contact with the tree trunk. Keep it separated a few inches from the trunk. Fertilize annually in the spring with an organic fertilizer.