About the Disease
Fusarium dieback symptoms: White powdery exudate either dry or surrounded by wet discoloration of the outer bark in association with a single beetle exit hole. While there is no visible injury to the bark at this stage of colonization, examination of the cortex and wood under the infested spot bored by the beetle reveals brown discolored necrosis caused by the fungus.
Known fungal species for pest-disease complex associated with PSHB are Fusarium euwallaceae, Graphium euwallaceae and Acremonium pembeum. KSHB carries new species of Fusarium and Graphium.