Effect of Environmental Factors on the Post-Infection Behavior of Gremmeniella abietina

Conidial production by Gremmeniella abietina was enhanced by growing the fungus in 8-oz. jars containing V-8 agar and a red pine twig. Survival of G. abietina at temperatures of 12 to 34C was closely related to average temperature and duration of exposure. The fungus survived 27 months in vivo without causing extensive necrosis of the host. Symptom development was more frequent among trees placed outdoors than among trees placed in a coldroom or greenhouse.