- Dying needles from inside to outside
- Dying needles from tree bottom to top
- Black fruiting bodies on needles
This disease infects older needles. Symptoms appear during the summer and include browning of needles and eventual needle drop. Symptoms start on the inner branches nearest the trunk and then spread outward toward branch tips, eventually moving up the tree. Symptoms are more likely to be seen on the north and west sides of trees. Irrigation that hits the tree may result in symptoms occurring throughout an infected tree. In severe case, all needles turn brown except the current year's growth.
Spores are released during late spring to summer and are spread by wind, water, and mechanically.
Adequately space trees to allow adequate air flow. Use drip irrigation and make sure that enough water is being applied during drought situations. Prune out diseased limbs. Thiophanate-methyl and myclobutanil are labeled and require multiple applications from late spring though summer. Larger trees should be treated by a trained professional.
Active Ingredients include: Myclobutanil, Thiophanate-methyl
