Effectiveness of Net Traps and Clove Oil in Controlling Large Black Chafers Beetle (Holotrichia parallela ) in Organic Pear Orchards
2019
Seo, H.J., National Institute of Horticultural & Herbal Science, Naju, Republic of Korea | Choi, E.D., National Institute of Horticultural & Herbal Science, Naju, Republic of Korea | Song, J.H., National Institute of Horticultural & Herbal Science, Naju, Republic of Korea
The purpose of this study was to investigate whether leaf damage in pear orchards caused by large black chafer beetles can be controlled through net traps and clove oil treatment. In June 2017, we measured large black chafer beetle population density and leaf damage rates in two orchards, located in Boseong and Hampyeong, under three treatments: net, net plus clove oil, and control. In order to evaluate the effect of net position on the adult beetles, nets were placed outside the orchard and along the upper and lower parts of a horizontal trellis. The adult beetle population density was 20.4 to 34.7% lower in the net alone treatment, and 21.1 to 38.1% lower in the combined net and clove oil treatment than in the control. The adult beetle population density was 10.9-14.4 times higher outside the orchard and 5.1 to 9.1 times higher in the upper parts of the horizontal trellis than in the lower parts of the horizontal trellis. Leaf damage under both the net only and net plus clove oil treatments was significantly lower than that in the control at both sites. Therefore, intensive net installation around orchards may be a practical organic alternative to prevent leaf damage caused by large black chafer beetles.
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