The research was conducted in the field of Taro village Gianyar regency and Katung village Bangli regency and at the Laboratory of Biotechnology Faculty of Agricultural Udayana University. The purpose of the research were to investigate population dynamic of Diaphorina citri Kuwayama and other insects that were assosiated with citrus cv. siam; and molecular detection of CVPD patogen in its vector, other phytophagous insects on citrus cv.siam and kemuning [Murraya paniculata (L.) Jack.] The result of this study showed that in six month period there was one peak of D. citri population which was associated with the flushing period of citrus at Taro as well Katung villages. The peak of D. citri population of Taro village was higher than that of Katung village. Two species of parasitoids and four spesies of predators were found in the field and may contribute in the suppression of D. citri population. The parasitoids identified were Tamarixia radiata Wat. and Diaphorencyrtus alligharensi Shaffe, whereas the predators were Curinus coeruleus Mulsant, Phiddipus sp., Menochilus sexmaculatus Fabricius and Oxyopes javanus Thorell. T. radiata has been proven to be an effective nymph parasitoid that could suppress the population development of D. citri in citrus orchads. The research revealed that kemuning could serve as a source of infection because it is also a host of CVPD disease as well as of D. citri. Toxoptera citricidus Kirkaldy and Maleuterpes dentipes Hell. were not proven to contain CVPD disease.

Sebagian besar penduduk Desa Katung, Kecamatan Kintamani, Kabupaten Bangli sebagai petani jeruk yang tergabung dalam kelompok Subak Abian Kerta Winangun yang beranggotakan 97 orang. Pertanaman jeruk di daerah ini sangat berhasil, sehingga pendapatannya meningkat. Namun belakangan, petani resah karena tanaman jeruknya terserang hama lalat buah. Oleh karena itu perlu diadakan penyuluhan dan pelatihan tentang pengelolaan hama lalat buah pada tanaman jeruk. Adapun tujuan penyuluhan dan pelatihan ini untuk memberikan pengetahuan dan keterampilan kepada para petani setempat tentang bahaya serangan hama lalat buah serta pengendaliannya pada tanaman jeruk meliputi : gejala serangan, faktor-faktor yang mempengaruhi perkembangan lalat buah dan cara pengendaliannya. Metode yang digunakan dalam pelatihan ini adalah penyampaian materi di ruangan dan praktek di perkebunan jeruk. Kegiatan penyuluhan dan demontrasi dilaksanakan hari Sabtu, tanggal 12 Agustus 2017 mulai pukul 10.00 sampai 14.00 WITA, bertempat di Balai Banjar Katung, Kecamatan Kintamani, Kabupaten Bangli. Pelatihan ini dipandu oleh 4 (empat) orang pelatih yang berasal dari Program Studi Agroekoteknologi Fakultas Pertanian Universitas Udayana. Pelatihan diikuti diikuti oleh 69 orang peserta. Penceramah memaparkan materinya dengan menggunakan alat peraga berupa power point dan menggunakan spesimen berupa gejala serangan lalat buah. Kemudian dilanjutkan dengan praktek lapangan selama 60 menit. Dalam pelaksanaan pelatihan tersebut, petani sangat antusias untuk mengikuti penyuluhan. Hal ini terbukti dari banyaknya pertanyaan-pertanyaan yang diajukan. Untuk mengetahui keberhasilan kegiatan ini, maka dilaksanakan evaluasi dengan pengisian kuisioner sebelum dan sesudah pelatihan.

Antioxidant is a chemical compound that could give one or more electrons to inhibit the free radical reaction. One of the plants that potentially produce antioxidants is purnajiwa (Euchresta horsfieldii (Lesch.) Benn.). The research was conducted using the fruit of purnajiwa. The purpose of this study is to know antioxidant activity from purnajiwa fruit using the DPPH method and measured by UV-Vis spectrophotometry. The extract of purnajiwa fruit gained by the maceration method using 96% ethanol solvent. The results of phytochemistry screening found out that the extract contains flavonoid, alkaloid, saponin, tannin, and terpenoid. According to flavonoid testing using quercetin, the results obtained from purnajiwa extract contained flavonoid of 1,651 mg QE/g. The activity test of antioxidants quantitatively by DPPH using UV-Vis spectrophotometry found out that purnajiwa extract has IC50 value of 57,28 ppm so that purnajiwa extract has strong antioxidant activity that could be used as natural antioxidant resources.

Composition of Rice Stem Borer Species and Their Egg Parasitoids at Different Altitudes. Rice stem borer is one of the main pest of rice plants that always percolating and attack plants in the field. The pests can result in damage to plants and lost of the grain from season to season. The aim of this research is to know composition and dominance rice stem borer species and role of their eggs parasitoid at an altitude of different places. Research is done by survey based on the height of different altitude in rice plants two weeks after cropping up until eleven weeks after planting. Research conducted from April until August 2019 in rice field that belonging to farmers at Subak Cemagi Let, Cemagi Village and Subak Teba, Mengwi village, Badung regency, Bali province. Subak Cemagi Let are at an altitude of 15 meters above sea level whereas Subak Teba are at an altitude of 300 meters above sea level. Identification of Rice stem borer larvae and their eggs parasitoid done in Pest Laboratory, Agriculture Faculty of Udayana University. Found three species rice stem borer in the height 15 mdpl namely Scirpophaga incertulas; Sesamia inferens dan Chilo suppressalis, whereas in the height 300 mdpl found four species namely Scirpophaga incertulas, Sesamia inferens, Chilo suppressalis, dan Chilo polychrysus.  S. incertulas was the most dominant at the two different altitude. Three species of eggs parasitoid that have role to suppress the development of rice stem borer at the different altitude namely Tetrastichus schoenobii, Telenomus rowani dan Trichogramma japonicum. T. schoenobii was the most dominant to suppress rice stem borer populations.

Bulung Sangu (Gracilaria spp) as many other macroalgae, is a source of beneficial phytochemical for health. Phytochemicals in macroalgae are widely used as active ingredients in cosmetic preparations. The study was aimed to determine the antioxidant properties of Bulung Sangu formulated in topical preparation. Bulung Sangu was macerated in ethanol 96% following by extract formulation in cream preparation in two concentrations: 5% and 10%. Antioxidant activity was determined against DPPH radical, compared to ascorbic acid. Percentage of reducing power in five concentration series (10, 20, 30, 40, and 50 µm/ml) statistical analyzes using one-way ANOVA with 95% of confidence level, following by IC50 measurement. Absorbance was read in wavelength of 517 nm. Concentration of 5% and 10% cream extract exhibited IC50 of 13,091 µg/ml and 11,867 µg/ml, respectively. These values are lower than IC50 of ascorbic acid (18,505 µg/ml), indicating the strong antioxidant properties of Bulung Sangu extract cream which is more potential than ascorbic acid. Bulung Sangu exhibit a potential source for being developed as medicine and cosmetics in topical preparation.