The stem borer Zeuzera multistrigata Moore (Lepidoptera, Cossidae): a serious pest undermining Eucalyptus plantations in Northern Vietnam

Zeuzera multistrigata Moore, 1881 (Lepidoptera: Cossidae) is a dangerous stem borer that damages the Eucalyptus plantations in Vietnam. Field surveys in Lao Cai and Phu Tho provinces in 2022 showed that Z. multistrigata frequently damaged Eucalyptus hybrid plantations (clone DH32-29) at the age of 16‒28 months with damage incidence ranging from 16.93 to 28.74% and the damage index from 0.49 to 1.08. This study showed that three E. urophylla clones (PN3d, PN46, PN54) were not damaged by Z. multistrigata, and five clones (PN10, PN21, PN24, PN47, PN108) were less damaged. Further studies are recommended to screen tolorance Eucalyptus varieties and develop an integrated pest management plan for this pest.