Teratosphaeria stem canker of Eucalyptus: two pathogens, one devastating disease

Area of Science:

• Plant Pathology
• Mycology
• Forestry

Background:

• Teratosphaeria gauchensis and Teratosphaeria zuluensis cause stem canker disease in Eucalyptus.
• This disease impacts commercial Eucalyptus plantations worldwide and spreads through plant germplasm trade.

Purpose of the Study:

• To identify and describe the causal agents of Teratosphaeria stem canker.
• To highlight the impact on vulnerable Eucalyptus species, particularly Eucalyptus grandis.

Main Methods:

• Observation of pycnidia on stem cankers.
• DNA sequence data for accurate diagnosis of fungal pathogens.

Main Results:

• Distinct stem cankers with dark pycnidia masses are characteristic.
• DNA sequencing is essential for precise identification of Teratosphaeria species.
• Eucalyptus grandis and its hybrids are highly susceptible.

Conclusions:

• Teratosphaeria stem canker poses a significant threat to global Eucalyptus plantations.
• Effective disease management requires accurate identification of causal agents using molecular methods.