Development of the Mass-rearing Technique for a Predatory Mite Stratiolaelaps scimitus (Acari: Laelapidae) Using the Double Box System
2018
Jung, D.O., Kyungpook National University, Gunwi, Republic of Korea | Hwang, H.S., Kyungpook National University, Daegu, Republic of Korea | Kim, J.W., Yecheon Agriculture Technology Center, Yecheon, Republic of Korea | Lee, K.Y., Kyungpook National University, Daegu, Republic of Korea
A mass-rearing method for a soil-dwelling predatory mite Stratiolaelaps scimitus (Womersley) was developed using the double box system. The rearing box consists of two, outer (22 L, 54 x 36 x 18 cm3) and inner (6.5 L, 31 x 22 x 11 cm3), plastic boxes. Inner box was filled with chaff (rice husks) which is used as the shelter of the predatory mites. Outer box contained 1 L of water and the inner box, then covered with a lid. This system prevents the predatory mites from escaping as well as keeping moisture of the shelter. In addition, Tyrophagus putrescentiae (Schrank), as prey mites of S. scimitus, was reared on the rice bran as a food source using the same double box system. The both mites were reared at 25 ± 1℃ , 60 ± 10% relative humidity condition. The prey mites were provided once a week. The density of predatory mites increased three times for four weeks and the final population was approximately 120,000 individuals/box (4 L). This is a simple mass-raring technique of S. scimitus and helpful for the biological control of soil pests.
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