The two-spotted spider mite, Tetranychus urticae Koch (TSSM)(Acari: Tetranychidae) is the major arthropod pest in strawberry greenhouses. Elevated levels of stress caused by high populations of TSSM can lead to a significant reduction in vegetative growth and flower development, which can decrease the quality and quantity of mature fruits. Currently, TSSM is managed by pesticide, and which makes that is distributed all over the world with various pesticide resistances and environmental side effects. To solve these problems, alternative pest management strategies are being tried. Biological control, one of alternative strategies, is relatively low toxicity and stable to agricultural ecosystems. I compared the density of TSSM in export strawberry greenhouses, those are under conventional pesticides and natural enemy applied, respectively, and also evaluated the cost of management of each control strategy.

• Juwan Kang(Department of Plant Medicine, Gyeongsang National University)
• Taechul park(Department of Plant Medicine, Gyeongsang National University)
• Hojeong choi(Department of Plant Medicine, Gyeongsang National University)
• Wonseok choi(Central Research Institute, Kyung Nong Corporation)
• Jung-joon park(Department of Plant Medicine, Gyeongsang National University Department of Applied Biology, Institute of Agriculture and Life Science, Gyeongsang National University)