However, on landscape junipers, the pycnidia were very difficult to find and were often obscured by other pycnidial fungi. In at least one case, the canker and pycnidia were much lower on the branch than the symptoms. There are many other fungi on these junipers, so careful examination of the spores is a must. These conditions must persist for at least 7 hours. Symptoms may develop 3 to 5 days after infection and spores may be produced within 3 to 4 weeks.
Infection can occur at any time there is susceptible new foliage and conducive weather conditions.
Though this is primarily a disease of seedlings, junipers in the landscape can be infected but seldom die. Rocky Mountain juniper and eastern red cedar are especially susceptible. At this point, we cannot recommend fungicides for control of Phomopsis blight in the landscape and in wind breaks. If next year is dry, it is possible this disease will disappear - or at least go back into hiding. To control Phomopsis blight, it is first necessary to get an accurate diagnosis.