Abstract: The paper deals with the effect of using Steinernema feltiae Agtriotos to control Holcocerus insular is Stgr..The results showed that control effects were influenced by temperature, dosage, and instar of larva. At 25℃, the host could be killed by it within 3 days, at 35℃, the nematode was effective. At 10℃, the host mortality was 25% within 10 days. When a 1-year-old host was parasitized by 6.8 or 21.6 nematodes, the mortality was 70% or 90% respectively, when a 2-year-old host was parasitized by 27.2 or 86.2 nematodes, 70% or 90% respectively.