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간자와응애와 主要 天敵의 發生 消長 및 使用藥劑의 긴털이리응애와 간자와응애에 대한 感受性 比較
金道翊(Do-Ik Kim),李升燦(Seung-Chan Lee),白采勳(Chae-Hoon Paik),金桑洙(Sang-Soo Kim),馬坰鐵(Kyoung-Chul Ma) 한국차학회 1997 한국차학회지 Vol.3 No.1
Population fluctuation of natural enemies including Amblyseius womersleyi, A eharai, Agistemus fleschneri, and predacious thrips showed the highest peak in mid-June but disappeared in July and August. However, the density of A. fleschneri increased after late Soptember in non-spray fields. In conventional spray fields, the density of Tetranychus kanzawai was lower than that in non-spray fields due to several pesticides applications. The density of natural enemies was very low as compared with that of non-spray fields. Despite several applications of pesticides, the population of T. kanzawai was not suppressed efficiently but increased continuously. The susceptibility of 20 pesticides commercially used for control of tea pests were evaluated to A. womersleyi at the recommended concentrations. Mancozeb, a fungicide, killed 100% of A. womersleyi and other fungicides also showed high toxicities. Most insecticides were highly harmful to A. womersleyi. Among the tested acaricides, fenbutatin oxide could be used for the T. kanzawai in view of IPM because it was less toxic to A. womersleyi than to T. kanzawai.
차응애의 밀도변화가 긴털이리응애의 포식능력과 산란에 미치는 영향
김도익(Do-Ik Kim),김상수(Sang-Soo Kim),백채훈(Chae-Hoon Paik),이건휘(Geon-Hui Lee),마경철(Kyoung-Chul Ma) 한국차학회 1997 한국차학회지 Vol.3 No.2
These experiments were conducted to investigate the functional response and oviposition of the predatory mite, Amblyseius womersleyi at the different densities and stages of tea red spider mite, Tetranychus kanzawai. The functional response curve of the adult A. womersleyi to the density of eggs, larvae, and nymphs of T. kanzawai indicated Holling`s Type Ⅱ (saturation type): the consumption of prey by the adult A. womersleyi increased with the prey density but the consumption rate decreased. The number of eggs laid by the adult A. womersleyi to the density of each developmental stage of T. kanzawai tended to increase with increasing prey density of 32~64. High level of prey slightly decreased the oviposition of A. womersleyi. Results are discussed in relation to the optimum release ratio of A. womersleyi for biological control or integrated management of T. kanzawai.