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All Journal Jurnal Silvikultur Tropika (JST) Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Hutan Tropika Jurnal Pusat Inovasi Masyarakat Jurnal Sylva Lestari Biodiversitas Journal of Biological Diversity
Istikorini, Yunik
Department Of Silviculture, Faculty Of Forestry And Environment, IPB University
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Energy Environmental Science Materials Science & Nanotechnology Physics Social Sciences

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Evaluation of Leaf Spot and Blight Diseases in Mahogany (Swietenia mahagoni) Seedlings in Rumpin Nursery, Bogor Regency, Indonesia Islami, Naluri Siyasah; Istikorini, Yunik; Lelana, Neo Endra; Wulandari, Arum Sekar
Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Vol 16 No 1 (2026): Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (JPSL)
Publisher : Pusat Penelitian Lingkungan Hidup, IPB (PPLH-IPB) dan Program Studi Pengelolaan Sumberdaya Alam dan Lingkungan, IPB (PS. PSL, SPs. IPB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jpsl.16.1.25

Abstract

Seedling propagation in nurseries often faces problems such as disease attack. Leaf spot and blight are the main threats that usually hamper the growth of small-leaf mahogany (Swietenia mahagoni (L.) Jacq.) seedlings in the nursery. This study aims to determine the incidence and severity of disease, factors affecting the development of leaf spot and blight on small-leaf mahogany seedlings, and identify the causative pathogen. The research method included observations of disease incidence and severity in two sample plots representing the nursery with a sampling intensity of 10%. Leaf samples showing disease symptoms were isolated and tested for Koch’s Postulates. The result showed that the incidence of leaf spot and blight reached 95,44% and the disease severity was lower (44,72%). The environmental conditions at Rumpin Nursery, including high rainfall and humidity, as well as moderate temperatures (22-30 °C), favored the spread of disease. There were four types of fungal pathogens of leaf spot and blight on small-leaf mahogany seedlings, namely Pestalotiopsis sp., Rhizoctonia sp., Colletotrichum sp., and Bipolaris sp., with an incubation period of 1-2 days. This incubation period indicates rapid infectious ability under favorable environmental conditions.
RESPONS PERKECAMBAHAN BENIH KOPSIA (Kopsia arborea Blume) PADA TINGKAT KEMATANGAN BUAH YANG BERBEDA DAN APLIKASI RIZOBAKTERI H, Rachmad Chaerul; Chaerul H, Rachmad; Wulandari, Arum Sekar; Istikorini, Yunik
Journal of Tropical Silviculture Vol. 16 No. 03 (2025): Jurnal Silvikutur Tropika
Publisher : Departemen Silvikultur, Fakultas Kehutanan dan Lingkungan, Institut Pertanian Bogor (IPB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/j-siltrop.16.03.176-185

Abstract

Kopsia plants are known secondary metabolites. While extensive research has been conducted on the secondary metabolites of kopsia, studies on its cultivation and propagation techniques remain limited. This study aims to analyze the effects of fruit maturity level and rhizobacteria application on  kopsia seed germination. The treatment tested in this study included different fruit maturity levels (immature, semi-mature, and mature) and rhizobacteria application (0 g and 5 g). All mature fruits germinated successfully (68%), whereas immature and semi-mature fruits showed no germination at all (0%). The absence of germination in immature and semi-mature fuirts was due to the physiologically immature embryos. Rhizobacteria were found to accelerate seed germination in mature fruits, and the resulting kopsia seedlings exhibited better growth. Overall, kopsia seed germination occurred only in mature fruits. Rhizobacteria application helped balance shoot and root development.
Response of (Kopsia arborea Blume) Seed Germination to Rhizosphere Microbial Treatment Muhammad Ridwan; Arum Sekar Wulandari; Yunik Istikorini
Jurnal Penelitian Pendidikan IPA Vol 12 No 1 (2026)
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v12i1.12925

Abstract

Kopsia arborea Blume is a plant species with high bioactive potential, yet its cultivation remains underdeveloped. One of the primary challenges in generative propagation is the low viability and slow seed germination rate. This study aims to analyze the effect of generative materials and rhizosphere microbes on the germination of Kopsia seeds. The generative materials used include whole fruits and fruit embryos of Kopsia. The rhizosphere microbes applied consist of a mixture of Trichoderma sp., Bacillus sp., Pseudomonas sp., and Azospirillum sp. The generative materials were cultivated in sand media over a two-month observation period. The observed parameters included the germination process, germination capacity, maximum growth potential, mean germination time, germination rate, vigor index, plant height, seedling length, total fresh weight, total dry weight, and shoot-root ratio. The treatment of generative materials significantly influenced germination capacity, mean germination time, germination rate, total fresh weight, total dry weight, and shoot-root ratio. Microbial applications affected germination capacity, mean germination time, maximum growth potential, vigor index, and seedling length. Overall, both whole fruits and embryos of kopsia are suitable for generative propagation. However, microbial applications are only necessary when propagation is conducted using whole fruits.
Pelatihan Pembuatan Pupuk Hayati pada Sistem Agroforestri berbasis Kopi di Desa Garahan, Jember, Jawa Timur Yunik Istikorini; Muhammad Alam Firmansyah; Lufthi Rusniarsyah; Ikhwan Shodiq; Tiska Aulia Azzahra; Idelia Latifah
Agrokreatif: Jurnal Ilmiah Pengabdian kepada Masyarakat Vol. 9 No. 2 (2023): Agrokreatif Jurnal Ilmiah Pengabdian Kepada Masyarakat
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/agrokreatif.9.2.191-198

Abstract

The productivity of coffee plants on the most cultivated land in Garahan Village decreased. This decline is thought to be caused by, among others, climate change, land degradation and the presence of pests and diseases in coffee plants. This training aims to introduce pests and diseases in coffee-based agroforestry to farmers and develop environmentally friendly biofertilizers. This activity begins with a pre-test, socialization and training and ends post-test. Based on the survey and direct observation, coffee plants found upas fungal diseases, root diseases, and stem borer pests. The agroforestry system applied is complex and straightforward agroforestry. In complex agroforestry, coffee plants are grown with various other crops, such as pepper, vanilla, leucaena, taro, banana, gamal, and mahogany. Simple agroforestry consists of coffee land planted with single-shade crops such as leucaena and gamal or a combination of Leucaena and pine. The training results showed an increased farmer's better understanding of coffee pests and diseases, the benefits of agroforestry, and the manufacture of biofertilizers. The biofertilizer developed is expected to increase the productivity of coffee plants.
Early growth evaluation and estimation of heritability in a sengon (Falcataria moluccana) progeny testing at Kediri, East Java, Indonesia aditya nugroho; DEDEN D. MATRA; ISKANDAR Z. SIREGAR; NOOR F. HANEDA; YUNIK ISTIKORINI; RIKA RAHMAWATI; YAHYA AMIN; ULFAH J. SIREGAR
Biodiversitas Journal of Biological Diversity Vol. 22 No. 5 (2021)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d220534

Abstract

Abstract. Nugroho A, Matra DD, Siregar IZ, Haneda NF, Istikorini Y, Rahmawati R, Amin Y, Siregar UJ. 2021. Early growth evaluation and estimation of heritability in a sengon (Falcataria moluccana) progeny testing at Kediri, East Java, Indonesia. Biodiversitas 22: 2728-2736. Sengon (Falcataria moluccana) is widely cultivated as a monoculture plantation in community forests that still poses a high risk of pest and disease attacks.  Although plants naturally show signs of resistance, there is still however a lack of understanding on the influence of relative plant resistance on growth due to environmental and genetic factors. This study was aimed to evaluate the early growth of a sengon progeny testing in Kediri, East Java and to estimate the genetic parameters with respect to its resistance and susceptibility to stem borer and rust disease. Progeny test was designed using randomized complete block design (RCBD) with four blocks as replications. Each block consists of 100 families which was grouped into two categories, 50 families for resistant group and 50 families for susceptible group. Observations were made at the age of 0 and 9 months after planting on 9 individuals per plot in each family. Growth characteristics were measured as germination (%), height (m), and diameter (cm). Results indicated that the sengon growth rate from resistant and susceptible plant groups showed a significant difference. Heritability values are classified as moderate, ranging between 0.107 to 0.133 and 0.102 to 0.150 for height and diameter variables, respectively. These information may be used for gradual selection by considering the appropriate intensity.
Chemical characteristics of Falcataria moluccana wood infested by Boktor stem borer (Xystrocera festiva) NOOR FARIKHAH HANEDA; ASEP HENDRA SUPRIATNA; HASYYATI SHABRINA; Yunik Istikorini; Ulfah J Siregar; Imam Wahyudi
Biodiversitas Journal of Biological Diversity Vol. 22 No. 10 (2021)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d221010

Abstract

Abstract. Haneda NF, Supriatna AH, Shabrina H, Istikorini Y, Siregar UJ, Wahyudi I. 2021. Chemical characteristics of Falcataria moluccana wood infested by Boktor stem borer (Xystrocera festiva). Biodiversitas 22: 4203-4208. Boktor (Xystrocera festiva Thoms.) is the most destructive and detrimental pest in Falcata plantations in Indonesia. It attacks the inner bark of sapwood when the tree reaches 3-years-old. This study aimed to analyze the chemical characteristics of Falcata woods, which were infested with Boktor in trees aged 3 and 4 years, compared to the healthy tree at 2 years old. The primary chemical components and type of extractive compounds were analyzed using standard procedures. The results showed a decrease in hemicellulose and an increase in lignin content of infected wood. This condition occurs because Boktor larvae prefer hemicellulose rather than lignin, which is related to the presence of enzymes in the digestive system of the larvae. The decreasing extractive contents as trees grow and undergo age-related shifting metabolism can be alleged as the start of Boktor infestation in 3-years-old trees. Boktor infestation also altering the wood chemical components by degrading the lignin that produced 4-vinyl-syringol. The isoeugenol compound is thought to prevent Boktor infestation in the early period of tree growth.
Isolation and identification of fungi associated with Falcataria moluccana gall-rust in Kediri, East Java, Indonesia YUNIK ISTIKORINI; NOFITA NUR CAHYANI; NOOR FARIKHAH HANEDA; HASYYATI SHABRINA; ADITYA NUGROHO; FITRI INDRIANI; ULFAH JUNIARTI SIREGAR
Biodiversitas Journal of Biological Diversity Vol. 23 No. 12 (2022)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d231211

Abstract

Abstract. Istikorini Y, Cahyani NN, Haneda NF, Shabrina H, Nugroho A, Indriani F, Siregar UJ. 2022. Isolation and identification of fungi associated with Falcataria moluccana gall-rust in Kediri, East Java, Indonesia. Biodiversitas 23: 6171-6179. Gall-rust disease caused by Uromycladium falcatariae is the most important disease of sengon in Indonesia. Plant pathogenic parasitism as a biological control mechanism is usually associated with fungal biocontrol agents. This study aimed to isolate and identify the fungi associated with the sengon gall rust from the Forest Management Unit of Jatirejo, Indonesian State Forest Company, Kediri. Fungi were isolated from the black or gray-green patches of gall-rust samples on Potato Dextrose Agar (PDA) plates. The fungi were identified using macroscopic and microscopic examinations. The molecular identification of fungal DNA was amplified by PCR using a specific internal transcribed spacer primer (ITS1/ITS4). The PCR products were sequenced and compared with the other related sequences in GenBank (NCBI). DNA barcode identification results showed 9 isolates containing of 8 species, namely Fusarium oxysporum, F. solani, F. chlamydosporum, F. circinatum, F. incarnatum, F. verticillioides, Lasiodiplodia theobromae, and Pestalotiopsis palmarum. This result showed that the Fusarium was the most fungi commonly found fungi on the gall's rust teliospore surface.
Co-Authors ADITYA NUGROHO aditya nugroho Ahmad Faqih Alam, Ilham Fatkhy Ardian, Dava Putra Arum Sekar Wulandari ASEP HENDRA SUPRIATNA Budiman, Thurfah Chaerul H, Rachmad DEDEN D. MATRA DIMAS ANDRIANTO Febrina Keumala, Cut Fiqri, Muhammad FITRI INDRIANI Fitrianingrum Kurniawati, Fitrianingrum Fortunata, Maura Rezky H, Rachmad Chaerul HASYYATI SHABRINA HASYYATI SHABRINA Idelia Latifah Ikhwan Shodiq Imam Wahyudi Irdika Mansur ISKANDAR Z. SIREGAR Islami, Naluri Siyasah Lufthi Rusniarsyah, Lufthi Maulina, Alaysha Mubin, Nadzirum Muhammad Alam Firmansyah Muhammad Ridwan Navizan, Fadhli Zhafran Neo Endra Lelana, Neo Endra NOFITA NUR CAHYANI NOOR F. HANEDA Noor Farikhah Haneda Okta Yulia Sari Padilah, Sinta Nur RIKA RAHMAWATI Rohmah, Sabila Nur Sari, Okta Yulia Sutanto, Vallari Kalea Ananda Tiska Aulia Azzahra Ulfah J Siregar ULFAH J. SIREGAR Ulfah Juniarti Siregar Wahyu Krisna YAHYA AMIN Yus Septiawati