Abstract
Spiders are the main predators in paddy ecosystem. Application of entomopathogenic fungus, such as Beauveria bassiana (Balsamo) is not expected to have any negative effect on spiders in the paddy field. This research was aimed to compare species composition, abundance, and species richness of spiders in ratoon paddy. The research was done on three hectares of rice fields that were treated with the following treatment, (i) 2 L/ha/application of liquid B. bassiana, (ii) 2 L/ha/application compost extract (without liquid B. bassiana), and (iii) a combination of liquid B. bassiana and compost extract with each using the same 2L/ha/application dose. The result of this research showed that B. bassiana bioinsecticide application did not affect the abundance and species richness of spiders in ratoon paddy. The treatments did not significantly affect species richness and abundance of the canopy-inhabiting spiders. The species richness and abundance of the soil-dwelling spiders on the paddy field applied by the bioinsecticide was not different from those without the bioinsecticide. The treatments did not effect species composition of the canopy-inhabiting and the soil-dwelling spiders. Application of B. bassiana bioinsecticide was not harmful for the spiders in the rice field.
Highlights
Padi ratun merupakan padi yang telah dipanen kemudian bertunas hingga berbuah kembali
The research was done on three hectares of rice fields that were treated with the following treatment, (i) 2 L/ha/application of liquid B. bassiana, (ii) 2 L/ha/application compost extract, and (iii) a combination of liquid B. bassiana and compost extract with each using the same 2L/ha/application dose
The result of this research showed that B. bassiana bioinsecticide application did not affect the abundance and species richness of spiders in ratoon paddy
Summary
Padi ratun (ratoon) merupakan padi yang telah dipanen kemudian bertunas hingga berbuah kembali. Serangga hama yang telah ditemukan menyerang padi ratun, antara lain adalah wereng dan walang sangit. Bioinsektisida dan kompos cair tersebut diaplikasikan pada tajuk tanaman padi di sore hari setiap minggu, mulai saat padi ratun berumur 14, 21, 28, dan 35 hari. Pengambilan contoh laba-laba penghuni tajuk ini dilakukan setiap minggu mulai saat padi ratun berumur 3 (sebelum aplikasi bioinsektisida), 17, 31, 38, 45, dan 52 hari umur ratun, serta 14 hari setelah padi ratun dipanen. Total spesies laba-laba penghuni tajuk yang ditemukan pada ketiga petak perlakuan adalah 18 spesies (Tabel 1). Dua spesies yang dominan ditemukan pada tajuk tanaman padi ratun pada penelitian ini adalah P. pseudoannulata dan Oxyopes javanus. Total semua spesies laba-laba penghuni permukaan tanah yang ditemukan pada ketiga petak perlakuan hanya 7 spesies (Tabel 2). Spesies laba-laba yang ditemukan di tajuk padi ratun yang diaplikasikan bioinsektisida cair, kompos cair, dan kombinasi bioinsektisida cair dan kompos cair
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