![]() ![]() Six extended IPM models were undertaken by forest companies giving pest control efficacies of 79.2–85.9%. An initial IPM model was developed for each pest and these gave control efficacies of 82.4% ( Da. ![]() ![]() Control options were manual collection of eggs and pupae and the use of light traps and biological agents. Three damage thresholds were considered: 50% loss of leaf area. Therefore, this study was undertaken to identify damage thresholds and to evaluate control options for implementing IPM in the Northeast and North Central regions of Vietnam. An integrated pest management (IPM) program is required to control these pests. Pine tussock moth ( Dasychira axutha Collenette (Lymantriidae)) and masson pine caterpillar ( Dendrolimus punctatus Walker (Lasiocampidae)) cause serious damage to Pinus massoniana and P.
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