The bird cherry-oat aphid (Rhopalosiphum padi), an important pest of cereal crops, not only directly sucks sap from plants, but also transmits a number of plant viruses, collectively the yellow dwarf viruses (YDVs). For quantifying changes in gene expression in vector aphids, reverse transcription-quantitative polymerase chain reaction (RT-qPCR) is a touchstone method, but the selection and val...

In this study we report the effects of fungal metabolites isolated from cultures of the fungus Trichoderma citrinoviride ITEM 4484 on the feeding preference of the aphid Rhopalosiphum padi, a major pest of cereal crops. Different phagodeterrent metabolites were purified by a combination of direct and reverse phase column chromatography and thin-layer chromatography. Chemical investigations, by ...

Local generalist predators can be exploited in conservation biological control of agricultural pests. To conserve and promote the most important predators, it is critical to have detailed knowledge about their prey range under natural conditions. I have studied predator-prey interactions between lycosid spiders from the genus Pardosa and a major aphid pest in spring-sown cereals; Rhopalosiphum ...

Upaya pengembangan komoditas padi di Provinsi Kalimantan Utara perlu memperhatikan aspek kondisi setiap wilayah karena dengan melihat tersebut dapat diketahui mana saja yang basis padi, sehingga perencanaan menjadi satu hal sangat penting masing-masing potensi sumberdaya ada mempunyai nilai strategis wilayah. Tujuan penelitian ini adalah (1) mengidentifikasi produksi padi; (2) mengetahui karakt...

We revisit the discussion about the relationship between price’s cyclical features, implicit collusion and the demand level in an oligopoly supergame where a positive shock may hit demand and disrupt collusion. The novel feature of our model consists in characterising the post-shock noncooperative price and comparing it against the cartel price played in the last period of the collusive path, t...

This study was aimed to determine nutritional value of lowland tidal grass fermented by probiotic microorganisms. This study used a completely randomized design and investigated two factors, namely varieties of lowland tidal grass (kumpai tembaga (Ischaemum rugosum), kumpai minyak (Hymenachne amplexicaulis) and kumpai padi (Oryza rufipogon)) and probiotic microorganism concentration (0.3, 0.5, ...

The furanoeremophilanes 6 beta-angeloyloxy-1,10-dehydrofuranoeremophilan-9-one (1), 6 beta-hydroxy-1,10-dehydrofuranoeremophilan-9-one (2) and 6 beta-propionyloxy-1,10-dehydrofuranoeremophilan-9-one (3) were isolated from Senecio otites, their structures elucidated by spectral analyses, and their insecticidal and phytotoxic properties evaluated. Compounds 1-3 proved to be effective aphid antife...

Persamaan dan perbedaan karakter yang dimiliki tanaman padi dapat digunakan untuk mengetahui hubungan kekerabatan antarvarietas padi. Penelitian ini bertujuan jarak genetik terbentuk pada beberapa varietas unggul terpilih dilaksanakan di Kebun percobaan Balai Besar Tanaman Padi Sukamandi. Metode penelitian yaitu metode deskriftif eksperimental dengan perlakuan sebanyak 44 padi, diulang 3 kali. ...

Penelitian bertujuan untuk mengetahui pengaruh karakteristik agronomi beberapa jenis padi lokal Aceh akibat pemberian pupuk Nitrogen. dilaksanakan di Desa Bangka Jaya, Kecamatan Dewantara, Kabupaten Utara, ini dilakukan bulan April-Agustus 2021. Metode yang digunakan yaitu Rancangan acak lelompok faktorial dengan dua faktor (P) dan Urea (N). Faktor 1 padi: P1=Padi Sigupai P2= Padi Sikuneng, P3 ...