Following infections, high temperatures intensify the severity of symptoms. Mature leaves appear to be more resistant. The disease begins as small lesions first appearing as tiny yellowish spots. As the fungus advances in to the water conducting tissues, diseased shoots fade becoming light green and eventually turning reddish brown. A greyish band or canker can be noted at the base of infected shoots.
Diseased shoots remain on the plant for sometime eventually turning grey.
This discoloration occurs later during the growing season. Twigs less than 1 cm in diameter may be girdled. Twigs 5 years old and younger may be affected by Phomopsis . Many of the same, Cupressus spp. Many of the same plants as attacked by P . juniperovora.