During spring, softwood or coniferous trees are susceptible to the fungus twig blight. When a tree becomes infected and the disease progresses, spots develop into purple or black blotches. The infection will move into the twigs, causing dieback, defoliation, and cankers. This fungus can cause root rot and trunk cankers.
There are several simple cultural methods which can dramatically reduce the severity of this disease.
- Pruning plants to increase air circulation and light penetration.
- Overhead irrigation should be avoided to prevent lower branches from inoculums splashing up from the soil below.
- Appropriate treatments have also been effective against this fungus and will stop the spread of the disease.
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