Biological Control of Thrips Using a Self-produced Predatory Mite Stratiolaelaps scimitus (Acari: Laelapidae) in the Greenhouse Chrysanthemum
2019
Jung, D.O., Kyungpook National University, Gunwi, Republic of Korea | Hwang, H.S., Kyungpook National University, Gunwi, Republic of Korea | Kim, S.Y., Gyeongsangbukdo Agricultural Research and Extension Services, Gumi, Republic of Korea | Lee, K.Y., Kyungpook National University, Gunwi, Republic of Korea
For greenhouse crops, thrips is one of the major insect pests, but its control is difficult owing to short generation time, rapid escaping behavior, and development of pesticide resistance. Stratiolaelaps scimitus (Womersley) is a soil-dwelling predatory mite attacking various soil invertebrate species, including thrips. Using the method by growers’ self-production, we mass-reared S. scimitus colony and investigated thrips control in the greenhouse chrysanthemum. The initial density of thrips was six individuals/flower. The treatment with one S. scimitus box in the greenhouse was estimated to be 1,000 individuals/m2. From August to September 2018, the greenhouse was released with a total of 10 boxes of S. scimitus. The density of thrips in the untreated and the treated cultivar was 53.7 ± 7.0 and 13.5 ± 1.7 on the late September, respectively, which indicated a reduction of 74.9% in the treated cultivar. Our results suggest that S. scimitus was highly effective for the control of thrips in the greenhouse chrysanthemum although temperature is very high during the summer season.
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