Zeuzera sp. (Lepidoptera: Cossidae) is a group of moths which the larvae is drilling holes into the stems and branches of tree. This study was conducted to record the population dynamic of Zeuzera sp. and to control the pest in Eucalyptus pellita plantation. The first damage of Zeuzera sp. was detected in 2017 at the E. pellita plantation block 4 (1 clone) owned by PT Korintiga Hutani in Central Kalimantan. It was found in 2 clones of block 5 in 2018, as well as in 3 clones of block 6 in 2019, and the tendency of the damage appeared widespread. The damage caused the broken top crown, swolen stem, and frass around the bottom part of the plant. Primary observation showed that there were several species of Zeuzera. The pest control was carried out by installing of delta trap + pheromone of Zeuzera pyrina. This pheromone trap was installed in 40 severely damaged locations. Each location had 1 trap installed. The results of monitoring with delta trap + pheromone showed that only 1 species of Zeuzera was found to be attracted by the pheromone. The density of captured adult varied depended on the clones and time of installation. The number of adult captured in May to July 2019 was 911. In conclusion, Zeuzera sp. damage in E. pellita plantation was gradually increased, and integrated pest management (silviculture, mechanical, biological, chemical) was required to prevent the damage.

ABSTRACT This study aims to analyze the implementation of learning design (RPS) by lecturers at UIN North Sumatra, especially for lecturers at PAI study program, which in its implementation has the Wahdatul Ulum concept. The focus of the study is on two things, namely the characteristics of wahdatul ulum-based learning and the wahdatul ulum-based Semester Learning Plan Model (RPS). The research method used is qualitative based on descriptive studies. Data collection techniques used are observation, interviews, and documentsation studies. The data obtained were then analyzed using the Miles and Huberman technique, namely data reduction, data display, and drawing conclusions. The results of the study explain that the implementation of learning planning based on Wahdatul Ulum is something that must be applied among UIN North Sumatra lecturers. The existence of its own characteristics or characteristics owned by UIN North Sumatra, namely Wahdatul Ulum, will certainly change all existing concepts, both in the form of lecturer lesson plans, learning strategies, learning evaluations and even learning materials or courses given. In this way, it cannot be denied that lecturers are required to make and understand the concept of Wahdatul Ulum in making lesson plans.   Keyword: Learning Planning, Wahdatul Ulum, Islamic Religious Education

Abstract. Haneda NF, Furqan M, Suheri M. 2020. Stem borer insects on Hopea odorata in Bogor, West Java, Indonesia. Biodiversitas 21: 5308-5316. Hopea odorata Roxb. locally known as “merawan”, is a dipterocarp species that has the potentials to be developed for plantation forestry. Nonetheless, anecdotal evidence in Bogor, West Java, Indonesia, suggested that the trees suffered serious attacks caused by stem borer insects, causing defoliation of the crown and leading to stunted growth and death. This phenomenon suggests a more systematic investigation. The objectives of this research were: (i) to identify the species of stem borer which attacked H. odorata; (ii) to investigate the types and forms of the damage of H. odorata tree due to stem borer attack; and (iii) to study the effects of stem borer attack on the tree and wood of H. odorata. The results showed that all species of stem borer insects belong to Coleoptera, namely as Xyleborus perforans (Scolytidae), Xyleborinus perexiguus (Scolytidae), Platypus parallelus (Platypodidae), Belionota prasina (Buprestidae), Curculionid beetle, and Tenebrionid beetle. The number of boring holes on a single tree was 1932 holes, of which 98.6% caused by ambrosia beetles: Xyleborus perforans (1426 holes, 73.8%), Xyleborinus perexiguus (457 holes, 23.7%), and Platypus parallelus (21 holes, 1.1%). The length of boring tunnel at cross-section ranged between 2-35 cm and at longitudinal section ranged between 4-6 cm. The number of boring holes decreased along with the increasing height of tree stem. The patterns of boring tunnel at stem cross-section were branching (X. perforans, P. parallelus); encircled (X. perforans), black stains along their wall (X. perexiguus, X. perforans, P. parallelus).

Recently, the attention of the global community is increasing to the phenomenon of climate change. Climate change could influence the imbalance of the forest ecosystem. Likely floods, forest fires, pests, and disease outbreaks are the important factors that can decrease forest productivity as a reciprocal relationship between forest disturbance and deforestation. The development of plantation forests and natural forest nurseries is one solution to maintain forest resources by reducing deforestation rates and conserving biodiversity. In this study, to conserve native trees of Kalimantan, we explored natural seedlings in their habitats as part of sustainable forest management. The study was conducted at IUPHHK-HTI PT Korintiga Hutani (PT KTH) from 2019 to date. Seedling explorations were carried out in Bukit Panjang and Sungai Inaf Besar. The collection method used wild seedlings (soil aggregate was still compacted in the roots). Furthermore, wild seedlings were grown in a polybag (23 × 15 cm) and stored in shading areas. Then, for acclimatization, it was transplanted to a natural forest nursery. These results suggest that the nursery has collected 9 families, 10 genus, 13 species, and 9791 individuals with 2680 individuals, represent the majority of dominance. As much of 600 seedlings of Dipterocarpaceae were planted at the river border in PT KTH.

Energi listrik yang kita rasakan saat ini merupakan energi listrik yang telah melalui proses panjang, yakni dari mulai pembangkitan energi listrik kemudian disalurkan melalui saluran udara tegangan tinggi, lalu sampai dipusat beban dan terakhir didistribusikan ke konsumen/masyarakat. Dalam proses penyaluran energi listrik sistem penyaluran/transmisi memegang peranan penting, untuk penghantar Saluran Udara Tegangan Tinggi (SUTT) 150 kV yang menghubungkan Gardu Induk (pusat beban). Dikarenakan beroperasi pada tegangan tinggi tentunya diperlukan tower yang kokoh dan tinggi supaya terhindar dari segala gangguan baik gangguan yang dapat di kontrol maupun gangguan yang tidak dapat dikontrol. Salah satu gangguan Transmisi yang tidak dapat dikontrol adalah gangguan petir. Didalam desain Tower SUTT yang dimiliki PLN saat ini memiliki pengaman dari petir yaitu DGS (Direct Grounding System) yang cukup efektif menurunkan ganguan akibat Petir dikarnakan semenjak pemasangan DGS tersebut ganguan akibat petir dapat di minimalisir.Kata kunci: Energi listrik, pusat beban, DGS