Abstract
Kanzawa spider mite, Tetranychus kanzawai Kishida (Tetranychidae) is one of the most important pest mite in Indonesia. This mite is known as the pest of many crops, including cassava. Neoseiulus longispinosus Evans (Phytoseiidae) is a predatory mite commonly found on plant infested by kanzawa spider mite. This predatory mite has high potential to be developed as biological control agent of T. kanzawai. The aim of this research is to elucidate the effective density and release time of N. longispinosus to control T. kanzawai on cassava. The research was conducted in the greenhouse, using cassava of Mentega cultivar. T. kanzawai were introduced into the cassava plants two weeks after planting, with density 5 female adults/plants. N. longispinosus were introduced 1, 2, and 3 weeks after T. kanzawai introduction with predator:prey ratio of 0:5, 1:5, 2:5, dan 3:5, respectively. Population of T. kanzawai and N. longispinosus, and also plant damage were observed at 6 weeks after planting. N. longispinosus could suppress T. kanzawai population and the highest suppression occurred at the interaction between 3:5 ratio and the release time at one week after T. kanzawai infestation. There was no significant effect of N. longispinosus release at various release ratio and time on attack intensity of T. kanzawai.
Highlights
Kanzawa spider mite, Tetranychus kanzawai Kishida (Tetranychidae) is one of the most important pest mite in Indonesia
Neoseiulus longispinosus Evans (Phytoseiidae) is a predatory mite commonly found on plant infested by kanzawa spider mite
This predatory mite has high potential to be developed as biological control agent of T. kanzawai
Summary
Bionomi dan Ekologi Serangga dan Rumah Kaca, Departemen Proteksi Tanaman, Fakultas Pertanian, IPB University. Tungau predator dipelihara secara massal di dalam tempat pemeliharaan yang telah diisi dengan pakan tungau predator, yaitu T. kanzawai (semua stadia pertumbuhan) yang berasal dari hasil perbanyakan T. kanzawai pada tanaman ubi kayu yang dipelihara di laboratorium. Imago betina tungau hama yang berumur empat hari dan telah kawin diinfestasikan pada permukaan bawah daun tengah dengan menggunakan kuas halus. Penentuan kepadatan populasi mangsa/tanaman mengacu pada uji pendahuluan Santoso & Astuti (2019) yang menjelaskan bahwa tanaman ubi kayu mengalami kematian satu minggu setelah diinfestasikan 15 imago betina T. kanzawai sehingga digunakan lima imago betina T. kanzawai untuk menghindari kematian tanaman pada awal pengamatan. Pelepasan tungau predator N. longispinosus pada berbagai rasio predator:mangsa berpengaruh nyata terhadap penekanan populasi tungau hama T. kanzawai (F3,6 = 176,93; P < 0,001) (Tabel 1). Populasi Neoseiulus longispinosus dan Tetranychus kanzawai (rata-rata ± SE) pada berbagai rasio pelepasan predator
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