sentences:  These wounds can be created by mechanical means such as tools, via insect entry, or in natural wounds due to environmental stress factors such as snow or ice.Generally, most infection is thought to occur in the early spring, although spring my also renew latent infections from the previous season, once environmental conditions are advantageous to the fungus.Typically, unfavorable environmental conditions such as drought, high temperatures, or site specific stresses favor development and infection of this disease.