Debus emarginatus, is a species of weevil widely distributed throughout the Old World tropics.
[1] It is native to China, India, Sri Lanka, Indonesia, Japan, Laos, Malaysia, Myanmar, Philippines, South Korea, Thailand, Vietnam, Australia, Papua New Guinea and Solomon Islands.
[5][6] It is a high-risk quarantine pest where they show inbreeding, with the males generally mating with their sisters within the parental gallery system before dispersal.
Adult beetle does not actually feed on the plant material but uses it as a medium for growing the fungus which is the larval food.
Attacked plants show signs of wilting, branch die-back, shoot breakage, chronic debilitation, sun-scorch or a general decline in vigour.