Abstract
Kanzawa spider mite (KSM), Tetranychus kanzawai Kishida (Acari: Tetranychidae) is an important pest on many crops in Indonesia. Generally, farmers use acaricide to control this mite, which may cause negative side effects. One of the alternative control methods is the use of predatory mite. This research was done to determine prey preference and functional response of predatory mite Neoseiulus californicus (Acari: Phytoseiidae) on several life stages of KSM. Experiments were conducted under laboratory conditions. N. californicus were supplied with nymphs and adults of KSM to know its preference. N. californicus were also supplied with KSM eggs at several densities to know its functional response. Adult females and deutonymphs of N. californicus preferred KSM eggs than nymphs as their prey. The number of eggs consumed by adult females and deutonymphs N. californicus increased with the increase of prey density. The number of eggs laid by adult females of N. californicus increased with the increase of prey density. Searching time of the predator became faster with the increase of prey density. N. californicus showed cannibalism under low density of prey. Key words: Neoseiulus californicus , functional response, prey preference
Highlights
Kanzawa spider mite (KSM), Tetranychus kanzawai Kishida (Acari: Tetranychidae) is an important pest on many crops in Indonesia
One of the alternative control methods is the use of predatory mite
N. californicus were supplied with nymphs and adults of KSM to know its preference
Summary
Penelitian dilaksanakan di Laboratorium Ekologi Serangga, Departemen Proteksi Tanaman, Fakultas Pertanian, Institut Pertanian Bogor dari bulan Juni 2007 sampai dengan Agustus 2007. Ke dalam arena percobaan yang berisi telur TLK dengan kepadatan 5, 10, 20, 40, dan 60 telur, masingmasing ditempatkan 1 individu imago betina atau deutonimfa N. californicus yang telah dipuasakan selama 6 jam. Ke dalam setiap arena percobaan kemudian dimasukkan 1 individu imago betina atau deutonimfa tungau N. californicus yang telah dipuasakan selama 6 jam. Ke dalam arena percobaan yang berisi 10 nimfa tungau merah dimasukkan deutonimfa, imago betina atau campuran (1 : 1) antara deutonimfa dengan imago betina tungau predator yang sudah dipuasakan selama 6 jam dengan kepadatan 2, 4, 6, dan 8 individu predator. Jumlah telur yang dimangsa deutonimfa dan imago betina predator masing-masing adalah 10,75 ± 5,00 dan 14,90 ± 4,87 telur, lebih tinggi dibandingkan dengan jumlah nimfa yang dimangsa dalam waktu yang sama, yaitu berturut-turut 6,30 ± 3,61; 9,45 ± 4,41 individu.
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